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Roman emperor Diocletian names Maximian his co-emperor ("Augustus")

The Roman emperor was the ruler of the Roman Empire, starting with the granting of the title augustus to Octavian in 27 BC. The title of imperator, originally a military honorific, was usually used alongside caesar, originally a cognomen. When a given Roman is described as becoming emperor in English, it generally reflects his accession as augustus, and later as basileus.

Accession of Daughter of Emperor Xiaoming of Northern Wei

Empress Yuan (12 February 528 – after 1 April 528), personal name unknown, was briefly an emperor of the Xianbei-led Chinese Northern Wei dynasty. She bore the surname Yuan (Chinese: 元; pinyin: Yuán), originally Tuoba. Yuan was the only child of Emperor Xiaoming (r. 515–528), born to his concubine Consort Pan. Soon after her birth, her grandmother the Empress Dowager Hu, who was also Xiaoming's regent, falsely declared that she was a boy and ordered a general pardon.

Alexios I Komnenos overthrows the Byzantine emperor Nikephoros III Botaneiates, and, after his troops spend three days extensively looting Constantinople, is formally crowned on April 4

Constantinople, the modern Istanbul, was the capital of the Roman and Byzantine Empire from 330 until its takeover by the Ottoman Empire in 1453. After this, it continued to function as the Ottoman capital Konstantiniyye until the abolition of the Ottoman sultanate in 1922.

Battle of the Curragh

The Battle of the Curragh (Irish: Cath an Churraigh) was a battle fought on 1 April 1234 on the Curragh plain in County Kildare, Ireland. The adversaries were men loyal to King Henry III of England on one side, and on the other side Richard Marshal, Earl of Pembroke and Lord of Leinster who lost the battle and later died from the wounds he suffered. The battle was a small affair in the number of knights involved, but was still significant because it ended the career of the popular Richard Marshal.

Ireland

Battle of Saintes

The Battle of Saintes was fought on 1 April 1351 during the Hundred Years' War between French and English forces. The French were besieging the town of Saint-Jean-d'Angély when an English relief force arrived. The English force was victorious, but was unable to fulfill its mission, to resupply the besieged. The town fell to the French on 31 August.

Expedition to Mostaganem (1543)

The Expedition to Mostaganem of 1543 was a failed expedition against the Algerian city of Mostaganem by the Spanish forces of Count Alcaudete.

This entry records the event's end date, as given in the source infobox.

Capture of Brielle

The Capture of Brielle by the Watergeuzen, on 1 April 1572 marked a turning point in the uprising of the Low Countries against Spain in the Eighty Years' War. Militarily the success was minor as the port of Brielle was undefended, but it provided the first foothold on land for the rebels at a time when the rebellion was all but crushed, and it offered the sign for a new revolt throughout the Netherlands which led to the formation of the Dutch Republic.

Brielle, Netherlands

In the Eighty Years' War, the Watergeuzen capture Brielle from the Seventeen Provinces, gaining the first foothold on land for what would become the Dutch Republic

The Seventeen Provinces (Dutch: Zeventien Provinciën, French: Dix-Sept Provinces, Spanish: Diecisiete Provincias) was a term used to describe the Spanish Netherlands before the Dutch Revolt, when they were at their largest extent. They covered most of the Low Countries, i.e., what is now the Netherlands, Belgium, Luxembourg, and most of the French departments of Nord (French Flanders and French Hainaut) and Pas-de-Calais (Artois).

Henry Morgan's raid on Puerto del Príncipe

The Raid on Puerto del Príncipe was a military event which took place during the latter stage of the Anglo-Spanish War between March and April 1668 on the Spanish island of Cuba. Some 700 Buccaneers in twelve ships led by Captain Henry Morgan landed in the Gulf of Santa María and marched to capture the inland town of Puerto del Príncipe.

This entry records the event's end date, as given in the source infobox.

Cuba

J. S. Bach's later Easter Oratorio in its first version is performed at the Nikolaikirche in Leipzig on Easter Sunday

The Easter Oratorio (Latin: Oratorium Festo Paschali; German: Oster-Oratorium), BWV 249, is an oratorio by Johann Sebastian Bach. He wrote an autograph score in Leipzig in 1738 under this title, matching his Christmas Oratorio and Ascension Oratorio. Bach had already composed the work in 1725, when he used most of its music for two compositions, the congratulatory Shepherd Cantata, BWV 249a (BWV 249.1), and a church cantata for Easter Sunday, Kommt, gehet und eilet ('Come, go and hurry'), BWV 249.3, that later became the oratorio.

1778 Rhode Island gubernatorial election

The 1778 Rhode Island gubernatorial election was held on April 1, 1778, in order to elect the governor of Rhode Island. Independent candidate and incumbent Chief Justice of the Rhode Island Supreme Court William Greene won the election as he ran unopposed. The exact number of votes cast in this election are unknown.

United States

1782 Massachusetts gubernatorial election

A gubernatorial election was held in Massachusetts on April 1, 1782. John Hancock, the incumbent governor, defeated Thomas Cushing, the incumbent lieutenant governor.

Massachusetts, United States

1789 Rhode Island gubernatorial election

The 1789 Rhode Island gubernatorial election was an uncontested election held on April 1, 1789, to elect the governor of Rhode Island. John Collins, the incumbent governor, was the sole candidate and so won with 100% of the vote.

United States

In New York City, the United States House of Representatives achieves its first quorum and elects Frederick Muhlenberg of Pennsylvania as its first Speaker

The United States House of Representatives is a chamber of the bicameral United States Congress; it is the lower house, with the United States Senate being the upper house. Together, the House and Senate have the authority under Article One of the Constitution of the United States in enumerated matters to pass or defeat federal legislation, known as bills.

1793 Massachusetts gubernatorial election

The 1793 Massachusetts gubernatorial election was held on April 1, 1793, in order to elect the Governor of Massachusetts. Incumbent Governor John Hancock won re-election as he ran unopposed.

Massachusetts, United States

1795 Rhode Island gubernatorial election

The 1795 Rhode Island gubernatorial election was held on April 1, 1795, in order to elect the governor of Rhode Island. Incumbent Democratic-Republican governor Arthur Fenner won re-election as he ran unopposed. The exact number of votes cast in this election are unknown.

United States

1799 Massachusetts gubernatorial election

The 1799 Massachusetts gubernatorial election was held on April 1. Incumbent Governor Increase Sumner was elected to a third term in office against minimal opposition. Sumner won the election on his deathbed and was unable to fulfill the duties of office. To avoid provoking a constitutional crisis, he took the office in early June before dying on June 7, 1799.

United States

1801 Rhode Island gubernatorial election

The 1801 Rhode Island gubernatorial election was an uncontested election held on April 1, 1801, to elect the governor of Rhode Island. Arthur Fenner, the incumbent governor, was the sole candidate and so won with 100% of the vote.

United States

1807 Rhode Island gubernatorial election

The 1807 Rhode Island gubernatorial election was held on April 1, 1807, in order to elect the governor of Rhode Island. Democratic-Republican nominee and incumbent United States senator from Rhode Island James Fenner defeated Federalist nominee Seth Wheaton.

United States

Battle of Puerto de Piñones

The Battle of Puerto de Piñones was a battle of the War of Mexican Independence that occurred on 1 April 1811 at Puerto de Piñones, Coahuila. The battle was fought between the royalist forces loyal to the Spanish crown, commanded by José Manuel de Ochoa, and the Mexican rebels fighting for independence from the Spanish Empire, commanded by Ignacio López Rayón. The battle resulted in a victory for the Mexican rebels. This battle was one of many battles that occurred between the armies of Ignacio López Rayón and José Manuel de Ochoa as López Rayón marched to take the industrial city of Zacatecas for the rebel cause.

Coahuila, Mexico

1811 Massachusetts gubernatorial election

The 1811 Massachusetts gubernatorial election was held on April 1, 1811. Elbridge Gerry, the incumbent Democratic-Republican governor, was re-elected to a second term after defeating Federalist nominee Christopher Gore.

Massachusetts, United States

1812 Rhode Island gubernatorial election

The 1812 Rhode Island gubernatorial election was held on April 1, 1812, in order to elect the governor of Rhode Island. Incumbent Federalist governor William Jones won re-election against former Democratic-Republican governor James Fenner in a rematch of the previous election.

United States

1822 Massachusetts gubernatorial election

The 1822 Massachusetts gubernatorial election was held on April 1. Federalist Governor John Brooks was re-elected to a seventh term in office over Republican William Eustis.

United States

Battle of Mocopulli

The Battle of Mocopulli (Spanish: Batalla de Mocopulli) was fought on April 1 of 1824 as the culmination of a Chilean patriots invasion plan against royalist Chiloé. The battle concluded in a royalist victory that delayed the incorporation of Chiloé into Chile to 1826 when a new invasion was launched. During all off the Chilean Independence War Chiloé Archipelago had remained under control of the royalist which enjoyed a wide support in the archipelago.

1827 Massachusetts gubernatorial election

The 1827 Massachusetts gubernatorial election was held on April 1. Governor Levi Lincoln Jr., an Adams Republican, was re-elected to a third term in office over William Jarvis, nominated on a "free bridge" platform. Jarvis declined to actively run for the office and his support was effectively limited to Middlesex and Essex, where the bridge issue was salient; in most other counties, he received only a handful of votes.

United States

1833 Connecticut gubernatorial election

The 1833 Connecticut gubernatorial election was held on April 1, 1833. Former senator and Democratic nominee Henry W. Edwards was elected, defeating incumbent governor and National Republican nominee John S. Peters with 41.31% of the vote. Peters won a plurality of the vote, but did not win a majority. The state constitution required in that case, the Connecticut General Assembly would elect the governor.

Connecticut, United States

Convention of 1833

The Convention of 1833 (April 1–13, 1833), a political gathering of settlers of Mexican Texas, was a successor to the Convention of 1832, whose requests had not been addressed by the Mexican government. Despite the political uncertainty succeeding from a recently concluded civil war, 56 delegates met in San Felipe de Austin to draft a series of petitions to the Alamo. The volatile William H.

1839 Connecticut gubernatorial election

The 1839 Connecticut gubernatorial election was held on April 1, 1839. Incumbent governor and Whig nominee William W. Ellsworth was re-elected, defeating former senator and Democratic nominee John M. Niles with 51.52% of the vote.

Connecticut, United States

Bellevue War

The Bellevue War refers to a shootout between a posse led by Sheriff W. A. Warren and Thomas Cox against a group led by W. W. Brown that took place in Bellevue, Jackson County, Iowa Territory on April 1, 1840. A large mural made by local artists commemorates the incident at the site of Brown's Hotel where it occurred. Political tensions in Bellevue date back to 1837, when Yankee businessmen arrived at the town, causing tensions with the original settlers. The original settlers banded with wealthy hotelier W. W. Brown, who provided them with credit and an opportunity to work.

Bellevue, Iowa, United States

1844 Connecticut gubernatorial election

The 1844 Connecticut gubernatorial election was held on April 1, 1844. Former state legislator, Amistad lawyer and Whig nominee Roger Sherman Baldwin was elected, defeating incumbent governor and Democratic nominee Chauncey Fitch Cleveland with 49.41% of the vote. Although Baldwin won a plurality of the vote, he fell short of a majority. The state constitution at the time required that in such a case, the Connecticut General Assembly decides the election.

Connecticut, United States

1846 Rhode Island gubernatorial election

The 1846 Rhode Island gubernatorial election was held on April 1, 1846, in order to elect the governor of Rhode Island. Law and Order nominee and incumbent lieutenant governor Byron Diman defeated incumbent Liberation governor Charles Jackson, who was jointly nominated by the Democratic Party. However, as no candidate received a majority of the total votes cast as was required by Rhode Island law, the election was forwarded to the Rhode Island legislature, who chose Diman as governor.

United States

Ten Days of Brescia

The Ten Days of Brescia (Italian: Dieci giornate di Brescia) was a revolt which broke out on 23 March 1849 in the Italian city of Brescia, then part of the Kingdom of Lombardy–Venetia, a Crown land of the Austrian Empire. The revolt, headed by the patriot Tito Speri, began on the same day as the Battle of Novara ended (though news of Austria's victory there had not yet reached Brescia) and ended on 1 April after 10 days of fierce fighting with the Austrian forces.

This entry records the event's end date, as given in the source infobox.

Italy

1850 Connecticut gubernatorial election

The 1850 Connecticut gubernatorial election was held on April 1, 1850. Former congressman and Democratic Party nominee Thomas H. Seymour defeated former state legislator and Whig nominee Lafayette S. Foster with 48.11% of the vote. Seymour won a plurality of the vote, but he did not receive a majority. As a result, the Connecticut General Assembly elected the governor, per the state constitution.

Connecticut, United States

1857 Rhode Island gubernatorial election

The 1857 Rhode Island gubernatorial election was held on April 1, 1857, in order to elect the governor of Rhode Island. Republican nominee Elisha Dyer defeated Democratic nominee Americus V. Potter.

United States

1861 Connecticut gubernatorial election

The 1861 Connecticut gubernatorial election was held on April 1, 1861. Incumbent governor and Republican nominee William Alfred Buckingham defeated Democratic nominee James Chaffee Loomis with 51.23% of the vote.

Connecticut, United States

Skirmish at Adamsville

The Skirmish at Adamville was a Battle that was fought between the Union army and the Confederate army in McNairy County, Tennessee, on April 1, 1862. The battle resulted a Confederate victory.

McNairy County, Tennessee, United States

Skirmish at Miskel Farm

The Skirmish at Miskel Farm, also known as the Fight at Miskel Farm or Gunfight at Miskel Farm, was a skirmish during the American Civil War. It took place April 1, 1863, near Broad Run in Loudoun County, Virginia, between Mosby's Rangers and the 2nd Pennsylvania Cavalry as part of Mosby's operations in Northern Virginia. The 2nd Pennsylvania surprised and attacked the Rangers, who were bivouacked on the farm of Thomas Miskel. The Rangers successfully defended the attack and subsequently routed the 2nd Pennsylvania, inflicting heavy casualties and taking many prisoners.

Loudoun County, Virginia, United States · Virginia, United States

Battle of Ebenezer Church

The Battle of Ebenezer Church was a battle that was fought near Plantersville, Alabama between Union Army cavalry under Brigadier General and Brevet Major General of volunteers James H. Wilson and Confederate States Army cavalry under Major General Nathan Bedford Forrest on April 1, 1865 during Wilson's Raid into Alabama near the end of the American Civil War. Forrest had at least 1,500 and as many as 5,000 troops but some were ill-trained Alabama State Troops. Wilson had at least 9,000 troopers of his original 13,480-man force available. Forrest had been unable to concentrate scattered Confederate forces to face Wilson's larger force, which was armed with 7-shot Spencer repeating carbines.

Alabama, United States

Battle of Five Forks

The Battle of Five Forks was fought on April 1, 1865, southwest of Petersburg, Virginia, around the road junction of Five Forks, Dinwiddie County, Virginia, during the end of the Richmond–Petersburg Campaign (sometimes called the Siege of Petersburg) and in the beginning stage of the Appomattox Campaign near the conclusion of the American Civil War. A mobile task force of combined infantry, artillery and cavalry from the Union Army commanded by Major General Philip Sheridan defeated a Confederate States Army combined task force from the Army of Northern Virginia commanded by Major General George E. Pickett.

Dinwiddie County, Virginia, United States

American Civil War: Union troops led by Philip Sheridan decisively defeat Confederate troops led by George Pickett, cutting the Army of Northern Virginia's last supply line during the Siege of Petersburg

The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States between the Union ("the North") and the Confederacy ("the South"), which was formed in 1861 by Southern states that had seceded from the Union to preserve slavery in the United States.

1866 Costa Rican general election

General elections were held in Costa Rica on 1 April 1866. José María Castro Madriz was elected president of Costa Rica for the 1866-1869 period, which would not finish since in 1868 he was overthrown by his predecessor Jesús Jiménez Zamora. Madriz had previously been president and had been overthrown in his first presidency.

Costa Rica

1867 Connecticut gubernatorial election

The 1867 Connecticut gubernatorial election was held on April 1, 1867. It was a rematch of the 1866 Connecticut gubernatorial election. Democratic nominee James E. English defeated incumbent governor, former Civil War general and Republican nominee Joseph Roswell Hawley with 50.52% of the vote. As this was held shortly after the end of American Civil War, some aspects of the National Union Party were still present.

Connecticut, United States

1868 Rhode Island gubernatorial election

The 1868 Rhode Island gubernatorial election was held on April 1, 1868, in order to elect the governor of Rhode Island. Incumbent Republican governor Ambrose Burnside won re-election against Democratic nominee Lyman Pierce in a rematch of the 1866 and 1867 election.

United States

1872 Connecticut gubernatorial election

The 1872 Connecticut gubernatorial election was held on April 1, 1872. Incumbent governor and Republican nominee Marshall Jewell defeated Democratic nominee Richard D. Hubbard with 50.02% of the vote.

Connecticut, United States

The White Star steamer SS Atlantic sinks off Nova Scotia, killing 547 in one of the worst marine disasters of the 19th century

Nova Scotia is a province in The Maritimes region of Canada, located on the nation's east coast. With an estimated population of over 1 million as of 2026, Nova Scotia is the most populous province in Atlantic Canada. Nova Scotia is also the second-most densely populated province in Canada, and the second-smallest province by area. The province comprises the Nova Scotia peninsula and Cape Breton Island, as well as 3,800 other coastal islands.

1874 Rhode Island gubernatorial election

The 1874 Rhode Island gubernatorial election was held on April 1, 1874, in order to elect the governor of Rhode Island. Incumbent Republican governor Henry Howard won re-election against Democratic nominee Lyman Pierce.

United States

1879 Chicago mayoral election

In the Chicago mayoral election of 1879, Democrat Carter Harrison III defeated both Republican Abner Wright and socialist Ernst Schmidt in a three-way race. Harrison had a nearly nine point margin of victory. Two-term incumbent Monroe Heath (who, at the time, was the longest-serving mayor in the city's history) did not run for reelection. The election took place on April 1.

Battle of Locumba

The Battle of Locumba was a battle of the Tacna and Arica campaign of the War of the Pacific that took place on April 1, 1880, between the Chilean cavalry and the Peruvian garrison at the town.

Peru

1882 Scottish Cup final (replay)

The 1882 Scottish Cup final was the ninth final of the Scottish Cup and the final of the 1881–82 Scottish Cup, the most prestigious knockout football competition in Scotland. The original match - which ended in a 2–2 draw - was played at the original Cathkin Park in Crosshill (today part of Glasgow) on 18 March 1882 and was watched by a crowd of 12,000 spectators.

This entry records the replay date, as explicitly given in the source infobox.

1885 Rhode Island gubernatorial election

The 1885 Rhode Island gubernatorial election was held on April 1, 1885. Republican nominee George P. Wetmore defeated Democratic nominee Ziba O. Slocum with 55.97% of the vote.

Rhode Island, United States

1887 All-Ireland Senior Hurling Championship final

The 1887 All-Ireland Senior Hurling Championship Final was a hurling match that was played at Birr Sportsfield, Birr on 1 April 1888 to determine the winners of the 1887 All-Ireland Senior Hurling Championship, the first season of the All-Ireland Senior Hurling Championship, a tournament organised by the Gaelic Athletic Association for inter-county hurling teams in Ireland.

Ireland

1891 Rhode Island gubernatorial election

The 1891 Rhode Island gubernatorial election was held on April 1, 1891. Democratic incumbent John W. Davis received 48.95% of the vote and Republican nominee Herbert W. Ladd 46.19%. With no candidate attaining a majority of the vote it was decided by the Rhode Island General Assembly The Republican majority selected Ladd.

Rhode Island, United States

1896 Rhode Island gubernatorial election

The 1896 Rhode Island gubernatorial election was held on April 1, 1896. Incumbent Republican Charles W. Lippitt defeated Democratic nominee George L. Littlefield with 56.40% of the vote.

Rhode Island, United States

Second Battle of Vailele

The Second Battle of Vailele was fought during the Second Samoan Civil War in 1899. British, American and Samoan forces loyal to Prince Tanu were defeated by a superior force of Samoan rebels loyal to Mata'afa Iosefo. Fighting occurred at the former German plantation of Vailele, Samoa and was a major engagement in the small colonial conflict.

Samoa

1901 Ulster Senior Hurling Championship

The 1901 Ulster Senior Hurling Championship was the inaugural edition of the annual Ulster Senior Hurling Championship held under the auspices of the Ulster GAA. The Championship consisted of a single match between Antrim and Derry, the only entrants. Antrim had competed in the previous year's All-Ireland Senior Hurling Championship having emerged from Ulster unchallenged. As a consequence, Antrim were treated as defending Ulster Champions despite no matches taking place.

1902 Milwaukee mayoral election

An election for Mayor of Milwaukee was held on April 1, 1902. Incumbent mayor David S. Rose was re-elected with 50% of the vote. Candidates included incumbent mayor David S. Rose, former state assemblyman Charles H. Anson, and Social Democrat Howard Tuttle.

1902 Ulster Senior Hurling Championship

The 1902 Ulster Senior Hurling Championship was the second edition of the annual Ulster Senior Hurling Championship held under the auspices of the Ulster GAA. The Championship consisted of a single match between Antrim and Derry, the only entrants. Antrim were two-time defending Ulster Champions. Derry emerged victorious by 2–7 to 2–5, to take the championship for the first time, and advanced to the semifinal of the 1902 All-Ireland Senior Hurling Championship, where they were defeated by Dublin.

The Territorial Force (renamed Territorial Army in 1920) is formed as a volunteer reserve component of the British Army

The Territorial Force was a part-time volunteer component of the British Army, created in 1908 to augment British land forces without resorting to conscription. The new organisation was created by the Territorial and Reserve Forces Act 1907 (7 Edw. 7. c. 9), which consolidated the 19th-century Volunteer Force and yeomanry into a unified auxiliary, commanded by the War Office and administered by local county territorial associations.

Palace Revolt of 1912

The Palace Revolt of 1912 (Thai: กบฏ ร.ศ. 130) was a failed uprising against the absolute monarchy of Siam. Discontent in the army during the reign of King Vajiravudh (Rama VI) led to the unsuccessful coup.

Thailand

Costa Rican general election, 1917

General elections were held in Costa Rica on 1 April 1917. Federico Tinoco Granados had seized power in a military coup in January and was the only candidate in the presidential election. The elections were considered to be fraudulent and although former president Rafael Yglesias Castro received 249 votes in Alajuela, they were recorded as invalid ballots.

Costa Rica

The Royal Air Force is created by the merger of the Royal Flying Corps and the Royal Naval Air Service

The Royal Air Force (RAF) is the air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the First World War on 1 April 1918 through the merger of the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS). Following the Allied victory over the Central Powers in 1918, the RAF emerged as the largest air force in the world.

Northampton by-election, 1920

The Northampton by-election, 1920 was a parliamentary by-election held for the British House of Commons constituency of Northampton on 1 April 1920.

United Kingdom

Siege of Aintab

The siege of Aintab (French: Les Quatres Sièges d'Aïntab; Ottoman Turkish: عین تاب قوشاتماسى; Turkish: Antep Kuşatması) was a military engagement between the Turkish National Forces and the French Army of the Levant occupying the city of Aintab (present-day Gaziantep) during the Turkish War of Independence (specifically its southern front, known as the Franco-Turkish War). Fighting began in April 1920, when French forces opened fire on the city.

This entry records the event's start date, as given in the source infobox.

Second Battle of İnönü

The Second Battle of İnönü (Turkish: İkinci İnönü Muharebesi) was fought between March 23 and April 1, 1921 near İnönü in present-day Eskişehir Province, Turkey during the Greco-Turkish War (1919–22), also known as the western front of the larger Turkish War of Independence. It marked a turning point in the Greco-Turkish War and the Turkish War of Independence of which it was a part, as Greek forces had previously been victorious over mostly irregular Turkish forces and suffered their first major halt in Asia minor campaign.

Turkey

In newly formed Northern Ireland, six Catholics are murdered in the Arnon Street killings, one week after six others were killed in the McMahon killings

The Arnon Street killings, also referred to as the Arnon Street murders or the Arnon Street massacre, took place on 1 April 1922 in Belfast, Northern Ireland. Six Catholic civilian men and boys, three in Arnon Street, were shot or beaten to death by men who broke into their homes.

1924 Cicero, Illinois, municipal elections

The 1924 Cicero, Illinois, municipal elections were elections held in 1924 to select municipal officers in Cicero, Illinois. The elections were notable for the gang-related violence which took place.

The Royal Canadian Air Force is formed

The Royal Canadian Air Force (RCAF; French: Aviation royale canadienne - ARC, lit. 'Canadian royal aviation') is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environmental commands within the unified Canadian Armed Forces.

1928 Argentine general election

General elections were held in Argentina on 1 April 1928. Hipólito Yrigoyen of the Radical Civic Union (UCR) was elected president, with the UCR also gaining a majority of seats in the Chamber of Deputies. Voter turnout was 81%.

Argentina

1930 Wisconsin Supreme Court special election

The 1930 Wisconsin Supreme Court special election was a special election held on Tuesday, April 1, 1930, to elect a justice to the Wisconsin Supreme Court. Incumbent justice Chester A. Fowler (appointed to fill a vacancy after the death on the bench of Aad J. Vinje) won election to the remainder of Vinje's term, defeating two challengers.

Wisconsin, United States

April 1933 Siamese coup d'état

The April 1933 Siamese coup d'état was an enforced change of government on 1 April 1933 by conservative and monarchist elites, led by Phraya Manopakorn Nititada (Phraya Mano), after the Draft National Economic Plan proposed by Pridi Banomyong, Khana Ratsadon's progressive leader, was deemed a communist threat by King Prajadhipok and Mano.

India's central banking institution, the Reserve Bank of India, is formed

The Reserve Bank of India (RBI) is the central bank of the Republic of India and the regulatory organisation for the Indian banking & financial system and Indian currency. It is owned by the Ministry of Finance, Government of India, it is responsible for the control, issue, and supply of the Indian rupee. It also manages the country's main payment systems & the foreign exchange under the FEMA Act, 1999.

The Royal New Zealand Air Force is formed as an independent service

The Royal New Zealand Air Force (RNZAF; Māori: Te Tauaarangi o Aotearoa) is the aerial service branch of the New Zealand Defence Force. It was formed initially in 1923 as a branch of the New Zealand Army, being known as the New Zealand Permanent Air Force, becoming an independent air force on 1 April 1937.

Final offensive of the Spanish Civil War

The final offensive of the Spanish Civil War took place between 26 March and 1 April 1939, towards the end of the Spanish Civil War. On 5 March 1939, the Republican Army led by Colonel Segismundo Casado and the politician Julián Besteiro rose against the Socialist prime minister Juan Negrín and formed a military junta, the National Defence Council (Consejo Nacional de Defensa or CND) in order to negotiate a peace deal. Negrín fled to France but the Communist troops around Madrid rose against the junta, starting a civil war within the civil war. Casado defeated them and started peace negotiations with the Nationalists.

Alicante, Spain · Almería, Spain · Ciudad Real, Spain · Cuenca, Spain, Spain · Murcia, Spain · Valencia, Spain

Spanish Civil War

The Spanish Civil War (Spanish: guerra civil española) was fought in Spain from 1936 to 1939 between the Republicans and the Nationalist rebels. Republicans loyal to the left-leaning Popular Front government of the Second Spanish Republic included socialists, anarchists, communists, and separatists, supported by the Soviet Union. The opposing Nationalists were an alliance of Falangists, monarchists, conservatives, traditionalists, syndicalists and fascists, supported by Nazi Germany and Fascist Italy.

This entry records the event's end date, as given in the source infobox.

Spain · Morocco · Western Sahara · Guinea

Spanish Maquis

The Maquis ([ˈmaki(s)]; Basque: Maki; also spelled maqui) were Spanish guerrillas who waged irregular warfare against the Francoist dictatorship within Spain following the Republican defeat in the Spanish Civil War until the early 1960s, carrying out sabotage, robberies, and assassinations of alleged Francoists as well as contributing to the fight against Nazi Germany and the Vichy regime in France during World War II.

This entry records the event's start date, as given in the source infobox.

Spain

1941 Iraqi coup d'état

The 1941 Iraqi coup d'état (Arabic: ثورة رشيد عالي الكيلاني), also called the Rashid Ali Al-Gaylani coup or the Golden Square coup, was a nationalist and pro-Nazi Coup d'état in Iraq on 1 April 1941 that overthrew the pro-British regime of Regent 'Abd al-Ilah and his Prime Minister Nuri al-Said and installed Rashid Ali al-Gaylani as Prime Minister. The coup was led by four Iraqi nationalist army generals, known as "the Golden Square", who intended to use the war to press for full Iraqi independence following the limited independence granted in 1932.

Iraq

Fântâna Albă massacre

The Fântâna Albă massacre took place on April 1, 1941, in Northern Bukovina when between 200 and 2,000 civilians were killed when their attempt to cross the border from the Soviet Union to Romania, near the village of Fântâna Albă, now in Chernivtsi Oblast, Ukraine, was met with open fire by the Soviet Border Troops. Although according to some data no more than 48 civilians were killed, local witnesses assert a much higher toll, claiming that survivors were tortured, killed, or buried in mass graves. Other survivors were allegedly taken away to be tortured and killed at the hands of the NKVD, the Soviet secret police.

Ukraine

1941 Wisconsin Supreme Court election

The 1941 Wisconsin Supreme Court election was held on Tuesday, April 1, 1941, to elect a justice to a full ten-year seat the Wisconsin Supreme Court. Incumbent justice Chester A. Fowler won re-election, defeating a challenge from Alvin C.

Wisconsin, United States

1941 Los Angeles mayoral election

The 1941 Los Angeles mayoral election took place on April 1, 1941, with a run-off election on May 6, 1941. Incumbent Fletcher Bowron was re-elected in the runoff election, defeating councilmember Stephen W. Cunningham. Municipal elections in California, including Mayor of Los Angeles, are officially nonpartisan; candidates' party affiliations do not appear on the ballot.

World War II: Navigation errors lead to an accidental American bombing of the Swiss city of Schaffhausen

World War II, or the Second World War (1 September 1939 – 2 September 1945), was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many engaging in total war on an unprecedented scale. World War II was the deadliest conflict in history, causing the deaths of 60 to 75 million people, a majority of whom were civilians.

Battle of Okinawa

The Battle of Okinawa (Japanese: 沖縄戦, Hepburn: Okinawa-sen), codenamed Operation Iceberg, was a major battle of the Pacific War fought on the island of Okinawa by the United States Army and United States Marine Corps forces against the Imperial Japanese Army. The initial invasion of Okinawa on 1 April 1945 was the largest amphibious assault in the Pacific Theater of World War II.

1946 Aleutian Islands earthquake

The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1, 1946. The shock measured (Mw) 8.6, Mt 9.3 or (Ms) 7.4. It had a maximum Mercalli intensity of VI (Strong). The seafloor along the fault was elevated, triggering a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–138 ft (14–42 m), resulting in 165–173 casualties and over US$26 million (equivalent to $429,000,000 in 2025) in damage.

Alaska, United States

Battle of Määritsa

The Battle of Määritsa (Estonian: Määritsa lahing), or the Battle of Osula (Estonian: Osula lahing), took place in Osula village, at that time in Võru County, Estonia. It began on the night of 31 March 1946, involving members of the Forest Brothers and Soviet occupation forces. Seven Estonian fighters based at the Hindrik farmhouse were besieged by up to 300 Soviet soldiers.

This entry records the event's end date, as given in the source infobox.

Estonia

1947 Chicago mayoral election

The Chicago mayoral election of 1947 was held on April 1, 1947. The election saw Democrat Martin H. Kennelly being elected, defeating Republican Russell Root by a more-than 17% margin of victory. The election was preceded by primary elections in February 1947 to determine the nominees of both the Democratic Party and the Republican Party.

Chicago, United States

1947 Wisconsin Supreme Court election

The 1947 Wisconsin Supreme Court election was held on Tuesday, April 1, 1947, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Henry P. Hughes defeated incumbent justice James Ward Rector (who had been appointed after the death on the bench of Joseph Martin). This was the first instance in nearly three decades in which an incumbent justice of the Wisconsin Supreme Court lost an election for their seat on the court.

Wisconsin, United States

The Government of Canada repeals Japanese-Canadian internment after seven years

The Government of Canada (French: gouvernement du Canada), formally His Majesty's Government (Gouvernement de Sa Majesté), is the federal executive of Canada, which includes ministers of the Crown (organized as the Cabinet) and the federal civil service (whom the Cabinet direct); it is corporately branded as the Government of Canada. There are over 100 departments and agencies, as well as over 300,000 persons employed in the Government of Canada.

1953 South American Championship play-off

The 1953 South American Championship play-off was a match held to determine the winner of the 1953 South American Championship, as Paraguay and Brazil were tied for the first place after the regular competition. The match took place on April 1, 1953, at Estadio Nacional in Lima, Peru. Paraguay won the match 3–2, winning its first continental title.

Lima, Peru

United States President Dwight D. Eisenhower authorizes the creation of the United States Air Force Academy in Colorado Springs, Colorado

Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; October 14, 1890 – March 28, 1969) was the 34th president of the United States, serving from 1953 to 1961. In his previous military career, he commanded the Allied Expeditionary Force during World War II, including in Operation Torch in North Africa and Operation Overlord on D-Day in Normandy. For his distinguished service in the U.S.

1 April attacks (Cyprus)

The 1 April Attacks were a series of attacks across Cyprus in 1955 by the Ethniki Organosis Kyprion Agoniston (EOKA) which led to the start of the Cyprus Emergency. Multiple British locations were attacked after midnight by EOKA members. This attack was accompanied by the distribution of leaflets across Cyprus.

Cyprus

1958 Wisconsin Supreme Court election

The 1958 Wisconsin Supreme Court election was held on Tuesday, April 1, 1958, to elect a justice to the Wisconsin Supreme Court for a ten-year term. William H. Dieterich defeated incumbent justice Emmert L. Wingert (who had been appointed after the death on the bench of Edward J. Gehl) by a comfortable margin. The election result was considered to be a seismic upset.

Wisconsin, United States

The TIROS-1 satellite transmits the first television picture from space

Television InfraRed Observation Satellite (TIROS) is a series of early weather satellites launched by the United States, beginning with TIROS-1 in 1960. TIROS was the first satellite that was capable of remote sensing of the Earth, enabling scientists to view the Earth from a new perspective: space. The program, promoted by Harry Wexler, proved the usefulness of satellite weather observation, at a time when military reconnaissance satellites were secretly in development or use.

Launch of the TIROS-1 weather satellite

A weather satellite or meteorological satellite is a type of Earth observation satellite that is primarily used to monitor the weather and climate of the Earth. Satellites are mainly of two types: polar orbiting (covering the entire Earth asynchronously) or geostationary (hovering over the same spot on the equator).

1964 Brazilian coup in the Paraíba Valley

The Paraíba Valley was the stage of military deployments by opposing forces during the 1964 Brazilian coup d'état: the rebel 2nd Army, coming from São Paulo towards Rio de Janeiro along the Via Dutra highway, and the loyalist School-Unit Group (Grupamento de Unidades-Escola; GUEs), coming from Rio de Janeiro in the opposite direction. The 2nd Army was commanded by General Amaury Kruel, in rebellion against the government of president João Goulart.

Brazil

Battle of Ap Gu

The Battle of Ap Gu occurred during 31 March and 1 April 1967 during Operation Junction City, a search and destroy mission by American military forces in Tay Ninh Province of South Vietnam, to the west of the capital Saigon. The battle near the border with Cambodia left 609 Viet Cong killed, 5 captured, and over 50 weapons of all types captured, while the Americans lost 17 killed and 102 wounded. Two American infantry battalions were scheduled to make an airborne assault into an area near the border with Cambodia to secure some roads and US bases, and to search and destroy communists in the surrounding area.

Tây Ninh province, Vietnam

1969 Los Angeles mayoral election

The 1969 Los Angeles mayoral election took place on April 1, 1969, with a run-off election on May 27, 1969. Incumbent Sam Yorty was re-elected over councilmember Tom Bradley, a win that had a record-breaking turnout. Yorty used race against Bradley to paint him as a mayor who would be open to Black nationalism and that he was inefficient against fighting crime.

1969 St. Louis mayoral election

The 1969 St. Louis mayoral election was held on April 1, 1969, in order to elect the mayor of St. Louis, Missouri. It saw the re-election of incumbent Democratic mayor Alfonso Cervantes over his Republican opponent Gerald Fisher.

9th National Congress of the Chinese Communist Party

The 9th National Congress of the Chinese Communist Party (CCP) was held in the Great Hall of the People, Beijing, between April 1 and 24, 1969. 1,512 delegates represented the party's estimated 22 million members. Preceded by the lengthy 8th Congress, the Congress was held at the height of the Cultural Revolution, and is considered to be a pivotal event.

This entry records the event's start date, as given in the source infobox.

1970 Berrechid Royal Air Maroc Caravelle crash

The 1970 Berrechid crash was an aviation incident involving a Sud Aviation SE-210 Caravelle III on a route between Agadir and Paris, with a stopover in Casablanca. During the descent, the airplane lost altitude near Berrechid, a city around 30 kilometers from the intermediate stop Casablanca. The crash resulted in 61 fatalities, with 21 survivors, six of whom were in critical condition.

President Richard Nixon signs the Public Health Cigarette Smoking Act into law

The Public Health Cigarette Smoking Act is a 1970 federal law in the United States designed to limit the practice of tobacco smoking. As approved by the United States Congress and signed into law by President Richard Nixon, the act required a stronger health warning on packages, saying "Warning: The Surgeon General Has Determined that Cigarette Smoking Is Dangerous to Your Health".

Arundel and Shoreham by-election, 1971

A by-election for the United Kingdom House of Commons was held in the constituency of Arundel and Shoreham on 1 April 1971, following the death of sitting Conservative Member of Parliament (MP) Henry Kerby. It was successfully held by the new Conservative candidate, Richard Napier Luce.

United Kingdom

Project Tiger

Project Tiger is a wildlife conservation movement initiated in India to protect the endangered tiger. The project was initiated in 1973 by the Ministry of Environment, Forest and Climate Change of the Government of India. As of March 2025, there are 58 protected areas that have been designated as tiger reserves under the project. As of 2022, there were 3,682 wild tigers in India, which is almost 75% of the world's wild tiger population.

Based on the recommendation of the task force, Project Tiger was launched on 1 April 1973 by the Department of Environment of the Government of India.

The Local Government Act 1972 of England and Wales comes into effect

The Local Government Act 1972 (c. 70) is an act of the Parliament of the United Kingdom that reformed local government in England and Wales on 1 April 1974. It was one of the most significant acts of Parliament to be passed by the Heath Government of 1970–74. The act took the total number of councils in England from 1,245 to 412 (excluding parish councils), and in Wales to 45.

1975 Chicago mayoral election

The Chicago mayoral election of 1975 was held on April 1, 1975. Democratic Party incumbent Richard J. Daley was elected to a record sixth term as mayor by a landslide 59% margin over Republican nominee John J. Hoellen Jr. Only one other individual (Daley's son Richard M. Daley) has since matched Daley's feat of winning six Chicago mayoral elections.

Chicago, United States

Steve Jobs and Steve Wozniak found Apple Computer, Inc

Steven Paul Jobs (February 24, 1955 – October 5, 2011) was an American businessman and investor. A pioneer of the personal computer revolution of the 1970s and 1980s, Jobs co-founded Apple Inc. with his early business partner Steve Wozniak as Apple Computer Company in 1976. After the company's board of directors fired him in 1985, he founded NeXT the same year and purchased Pixar in 1986, becoming its chairman and majority shareholder until 2007.

Iran: Islamic Republic established

Iran, officially the Islamic Republic of Iran, and historically known as Persia, is a country in West Asia. It borders Iraq to the west; Turkey, Azerbaijan, and Armenia to the northwest; the Caspian Sea to the north, Turkmenistan to the northeast; Afghanistan to the east; Pakistan to the southeast; and the Gulf of Oman and the Persian Gulf to the south.

1980 Wisconsin Supreme Court election

The 1980 Wisconsin Supreme Court election was held on April 1, 1980, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Incumbent justice Connor Hansen did not seek re-election. Donald W. Steinmetz narrowly defeated Louis J. Ceci in the general election. Preceding the general election was a nonpartisan primary held on February 19, in which the two had advanced from over P.

Wisconsin, United States

Siege of Aleppo (1980)

The siege of Aleppo refers to a military operation conducted by forces of the Ba'athist Syria led by Hafez al-Assad in 1980 during the armed conflict between the Sunni Islamist insurgents, including the Muslim Brotherhood, and the Ba'athist Syrian regime. Ba'athist Syrian forces committed several massacres in the course of the operation.

This entry records the event's start date, as given in the source infobox.

Syria

1981 Thai military rebellion

The 1981 Thai military rebellion was a military coup attempt to consolidate power by the government of Prem Tinsulanonda, staged by Thai military leaders of Class 7 on 1 April 1981, but a counter-coup by Prem, Arthit Kamlang-ek, and support by the royal family on 3 April led to the coup's failure, turning it into a rebellion.

Bangkok, Thailand

1986 Wisconsin Supreme Court election

The 1986 Wisconsin Supreme Court election was held on April 1, 1986, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Incumbent justice Roland B. Day was re-elected unopposed.

Wisconsin, United States

Communist Party of Nepal (Mashal) cadres attack a number of police stations in Kathmandu, seeking to incite a popular rebellion

The Communist Party of Nepal (Mashal) was an underground communist party in Nepal. CPN (Mashal) was formed in November 1984, following a split in the Communist Party of Nepal (Masal). The new party was founded at a congress (labelled the 'fifth congress') in Gorakhpur, India. It was difficult to identify any major ideological difference between the two factions, and probably the split was caused by dissatisfaction with Singh's authoritarian leadership methods.

Iraqi parliamentary election, 1989

Parliamentary elections were held in Iraq on 1 April 1989, having originally been scheduled for 31 August 1988, but postponed due to the Iran–Iraq War. The election was contested by 921 candidates, and saw the Ba'ath Party win 207 of the 250 seats.

Iraq

Margaret Thatcher's new local government tax, the Community Charge (commonly known as the "poll tax"), is introduced in Scotland

Margaret Hilda Thatcher, Baroness Thatcher (née Roberts; 13 October 1925 – 8 April 2013) was a British stateswoman who served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century and the first woman to hold the office.

WrestleMania VI

WrestleMania VI was the World Wrestling Federation's (WWF) sixth WrestleMania professional wrestling pay-per-view event and the first to be held outside of the United States. It took place on April 1, 1990, at the SkyDome in Toronto, Ontario, Canada with an announced attendance of 67,678 – then a record for the Skydome. Aside from its record-breaking attendance, the event is arguably best remembered for "The Ultimate Challenge" – the main event match which saw Hulk Hogan (WWF World Heavyweight Champion) vs. The Ultimate Warrior (WWF Intercontinental Heavyweight Champion), in which both championship titles were on the line.

Toronto, Canada

DHKP/C insurgency in Turkey

The DHKP/C insurgency in Turkey refers to the Marxist–Leninist insurgency waged by the Revolutionary People's Liberation Party/Front (DHKP/C) against the Republic of Turkey, ongoing since 1990. The insurgency began with political assassinations in the early 1990s, and has escalated in the past few years with the use of suicide bombers.

This entry records the event's start date, as given in the source infobox.

Turkey

1993 Tennessee Fairchild Merlin crash

On the evening of April 1, 1993, a Swearingen Merlin III twin turboprop, carrying NASCAR champion Alan Kulwicki, crashed near Blountville, Tennessee, while on approach to the nearby Tri-Cities Regional Airport. All four people on board, including Alan Kulwicki, two executives of his corporate sponsor Hooters, and the pilot, were killed.

Tennessee, United States

1997 St. Louis mayoral election

The 1997 St. Louis mayoral election was held on April 1, 1997 to elect the mayor of St. Louis, Missouri. It saw the election of Clarence Harmon and the defeat of incumbent mayor Freeman Bosley Jr. in the Democratic primary. The election was preceded by party primaries on March 4.

1997 Colorado Springs mayoral special election

The 1997 Colorado Springs mayoral special election took place on April 1, 1997, to elect the mayor of Colorado Springs, Colorado. The election was triggered by the resigning of incumbent mayor Robert M. Isaac. The election was held concurrently with various other local elections. The election was officially nonpartisan.

Mayoral elections in Overland Park, Kansas

Elections are held every four years in the off-year immediately after US presidential election years in Overland Park, Kansas to elect the city's mayor. Elections for city officials in Johnson County are held on the first Tuesday after the first Monday in November. If more than two candidates file to run for office, a primary must be held on the first Tuesday in August.

This entry records the general, as dated in the source infobox.

United States

Nunavut is established as a Canadian territory carved out of the eastern part of the Northwest Territories

Nunavut is the largest and northernmost territory of Canada. It was separated from the Northwest Territories in 1999, via the Nunavut Act and the Nunavut Land Claims Agreement Act, which provided this territory to the Inuit for self-government. The boundaries were drawn in 1993. The creation of Nunavut resulted in the first major change to Canada's political map in half a century since the province of Newfoundland, known as Newfoundland and Labrador since 2001, was admitted in 1949.

Super J-Cup (2000)

Super J-Cup: 3rd Stage was the third Super J-Cup professional wrestling tournament, it was hosted by Michinoku Pro Wrestling (MPW). The tournament was a single-elimination tournament of four rounds and was a two-night event featuring junior heavyweights from various Japanese promotions. The first round of the event was held on April 1, 2000 at Sendai City Gymnasium in Sendai, Japan and the final three rounds were held on April 9, 2000 at Sumo Hall in Tokyo, Japan, which had been the site for the previous two tournaments.

Japan

WrestleMania X-Seven

WrestleMania X-Seven was the seventeenth annual WrestleMania professional wrestling pay-per-view produced by the World Wrestling Federation (WWF). It took place on April 1, 2001 at the Reliant Astrodome in Houston, Texas, the first WrestleMania held in the state of Texas. A record-breaking attendance for the Reliant Astrodome of 67,925 grossed US$3.5 million. The main event was a No Disqualification match between Stone Cold Steve Austin and The Rock for the WWF Championship. The undercard included Triple H versus The Undertaker, the second Tables, Ladders, and Chairs match for the WWF Tag Team Championship and a Street Fight between Vince McMahon and Shane McMahon.

Houston, United States · Texas, United States

An EP-3E United States Navy surveillance aircraft collides with a Chinese People's Liberation Army Shenyang J-8 fighter jet. The Chinese pilot ejected but is subsequently lost. The Navy crew makes an emergency landing in Hainan, China and is detained

The Lockheed EP-3 is an electronic signals reconnaissance variant of the P-3 Orion, formerly operated by the United States Navy.

Former President of Federal Republic of Yugoslavia Slobodan Milošević surrenders to police special forces, to be tried on war crimes charges

Slobodan Milošević (Serbian Cyrillic: Слободан Милошевић, pronounced [slobǒdan milǒːʃevitɕ] , 20 August 1941 – 11 March 2006) was a Yugoslav and Serbian politician who was the president of Serbia between 1989 and 1997 and president of the Federal Republic of Yugoslavia from 1997 until his overthrow in 2000.

Hainan Island incident

A ten-day international incident between the United States and the People's Republic of China (PRC) resulted from a mid-air collision between a United States Navy EP-3E ARIES II signals intelligence aircraft and a People's Liberation Army Air Force J-8 interceptor on April 1, 2001. The EP-3 was flying over the South China Sea at a point roughly midway between Hainan Island and the Paracel Islands when it was intercepted by two J-8II fighters.

2002 Ketari by-election

The 2002 Ketari by-election was a by-election that was held on 1 April 2002 for the Pahang State Legislative Assembly seat of Ketari. It was called following the death of its Barisan Nasional assemblyman Loke Koon Kam on 3 March 2002. Loke won the seat on 1999 Malaysian state elections against Choong Siew Onn of Democratic Action Party with a majority of 231.

2003 Wichita mayoral election

The 2003 Wichita mayoral election took place on April 1, 2003, to elect the mayor of Wichita, Kansas. The election was held concurrently with various other local elections, and was officially nonpartisan. It saw the election of Carlos Mayans.

Kansas, United States

2003 Brown County, Wisconsin Executive election

The 2003 Brown County, Wisconsin Executive election took place on April 1, 2003, following a primary election on February 18, 2003. Incumbent County Executive Nancy Nusbaum declined to seek re-election to a third term. Three candidates ran to succeed her: former State Representative Carol Kelso, Hobart Village President Len Teresinski, and trucker Roy Leyendecker.

Wisconsin, United States

2003 Wisconsin Supreme Court election

The 2003 Wisconsin Supreme Court election was held on April 1, 2003, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Patience Roggensack defeated Edward R. Brunner and Paul B. Higginbotham (the latter of whom was eliminated in a nonpartisan primary). Incumbent justice William A. Bablitch did not seek re-election. Prior to the election, the court's ideological composition had 3 liberal justices, 3 conservative justices, and 1 centrist justice.

Wisconsin, United States

2003 Anchorage mayoral election

The 2003 Anchorage mayoral election was held on April 1, 2003, to elect the mayor of Anchorage, Alaska. It saw election of Mark Begich, who unseated incumbent mayor George Wuerch. An assembly ordinance and ballot proposition passed in Anchorage in 2003 had lowered the threshold required to avoid a mayoral runoff from 50% of the vote to 45%. Since Begich surpassed this margin, no runoff was necessary.

2003 Colorado Springs mayoral election

An election was held on April 1, 2003, to elect the mayor of Colorado Springs, Colorado. The election was held concurrently with various other local elections. The election was officially nonpartisan.

Mayoral elections in Green Bay, Wisconsin

Nonpartisan elections are currently held every four years to elect the mayor of Green Bay, Wisconsin. Wisconsin law provides that no party designation appears on the official ballot for city offices.

This entry records the general, as dated in the source infobox.

Iran–PJAK conflict

The Iran–PJAK conflict is an armed conflict between the Islamic Republic of Iran and Kurdish rebels of the Kurdistan Free Life Party (PJAK), which began in 2004. The group has carried out numerous attacks in the Kurdistan Province of Iran and provinces of Western Iran. PJAK is closely affiliated with the militant Kurdistan Workers' Party (PKK), the primary opponent of the Republic of Turkey in the Kurdish–Turkish conflict.

This entry records the event's start date, as given in the source infobox.

Iran · Iraq · Turkey

WWE Hall of Fame (2006)

WWE Hall of Fame (2006) was the event which featured the introduction of the 7th class to the WWE Hall of Fame. The event was produced by World Wrestling Entertainment (WWE) on April 1, 2006, from the Rosemont Theatre in Rosemont, Illinois. The event took place the same weekend as WrestleMania 22. The event was hosted by Jerry "The King" Lawler.

United States

WrestleMania 23

WrestleMania 23 was the twenty-third annual WrestleMania professional wrestling pay-per-view event produced by World Wrestling Entertainment (WWE). It was presented by 360 OTC and took place on April 1, 2007, at Ford Field in Detroit, Michigan. The event was the first WrestleMania at Ford Field and the second to take place in the Detroit metropolitan area (following WrestleMania III, at the Pontiac Silverdome, in Pontiac, Michigan). The event was a joint-brand pay-per-view, featuring performers from the Raw, SmackDown!, and ECW brands. Eight professional wrestling matches were featured on the event's supercard, a scheduling of more than one main event.

Michigan, United States

2007 Cambodian communal elections

Communal elections were held in Cambodia on 1 April 2007.

Cambodia

2007 Football League Trophy final

The 2007 Football League Trophy Final was the 24th final of the domestic football cup competition for teams from Football Leagues One and Two, the Football League Trophy. The final was played at the Millennium Stadium in Cardiff on 1 April 2007, the last time that the final would be played in the stadium. The match was contested by Bristol Rovers and Doncaster Rovers.

United Kingdom

2008 Milwaukee County Executive election

The 2008 Milwaukee County Executive election took place on April 1, 2008 in Milwaukee County, Wisconsin, US. Incumbent Republican County Executive Scott Walker ran for re-election to a second full term. He was challenged by Democratic State Senator Lena Taylor. Because they were the only two candidates on the ballot, the primary election was cancelled and they proceeded to the general election.

Wisconsin, United States

2008 Wisconsin Supreme Court election

The 2008 Wisconsin Supreme Court election was held on Tuesday, April 1, 2008, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Burnett County circuit judge Michael Gableman narrowly defeated incumbent justice Louis B. Butler, shifting the ideology of the court to a conservative majority. The court's majority ideological lean would remain conservative until after the 2023 election.

Wisconsin, United States

2008 Milwaukee mayoral election

The 2008 Milwaukee mayoral election was held on Tuesday, April 1, 2008, to elect the mayor for Milwaukee. Tom Barrett was reelected. Municipal elections in Wisconsin are non-partisan. The sole opponent of Barrett was Andrew J. Shaw, a nightclub owner and attorney. Shaw was Asian American, and if elected would have been the first Asian-American mayor of the city.

2008 Wisconsin spring election

On April 1, 2008, Wisconsin held its spring election. Voters decided a contested Wisconsin Supreme Court race, a state constitutional amendment referendum, and nonpartisan local and judicial offices. The presidential preference primary had already been held in February.

This records the spring election, separate from the November general election.

United States

UFC Fight Night: Condit vs. Kampmann

UFC Fight Night: Condit vs. Kampmann (also known as UFC Fight Night 18) was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on April 1, 2009.

Nashville, Tennessee, United States · Tennessee, United States

2010 in Konfrontacja Sztuk Walki

The year 2010 was the seventh year in the history of the Konfrontacja Sztuk Walki, a mixed martial arts promotion based in Poland. In 2010 Konfrontacja Sztuk Walki held 4 events beginning with, KSW: KSW Elimination.

2011 Mazar-i-Sharif attack

The 2011 Mazar-i-Sharif attack occurred on 1 April 2011 when a group of demonstrators attacked the United Nations Assistance Mission in Afghanistan (UNAMA) compound in Mazar-i-Sharif, Afghanistan, killing seven foreigners, including three United Nations staff members and four Nepalese guards. Additionally, five protesters died in the violence.

Afghanistan

Honor Takes Center Stage

Honor Takes Center Stage was a professional wrestling pay-per-view (PPV) event produced by Ring of Honor (ROH). It took place over two consecutive days, on 1 and 2 April 2011, at the Center Stage Theater in Atlanta, with the 1 April show at 8pm ET/5pm PT, and the 2 April show at a special matinee time of 1pm ET/10am PT.

This entry records the event's start date, as given in the source infobox.

Myanmar by-elections, 2012

The 2012 Myanmar by-elections were held on 1 April 2012. The elections were held to fill 48 vacant parliamentary seats. Three of those remained vacant as polling in three Kachin constituencies was postponed. There was no plan to fill the additional 5 seats cancelled in the 2010 election and 1 seat after a deceased RNDP member. The main opposition party National League for Democracy was re-registered for the by-elections on 13 December 2011 as part of the reforms in Burma since 2010. It won in 43 of the 44 seats they contested (out of 45 available).

Myanmar

Arumeru East by-election, 2012

The Arumeru East by-election was a by-election held for the Tanzanian parliamentary constituency of Arumeru East. It was triggered by the death of Jeremiah Sumari, the previous Member of Parliament (MP) who had held the seat for the Chama Cha Mapinduzi since 2005. The by-election took place on 1 April 2012 and the Chadema candidate won by 54.92%.

Tanzania

WrestleMania XXVIII

WrestleMania XXVIII was a 2012 professional wrestling pay-per-view (PPV) event produced by WWE. It was the 28th annual WrestleMania and took place on April 1, 2012, at Sun Life Stadium in Miami Gardens, Florida.

Florida, United States · Miami, United States

2012 Scottish Challenge Cup final

The 2012 Scottish Challenge Cup final, also known as the Ramsdens Cup final for sponsorship reasons, was an association football match between Falkirk and Hamilton Academical on 1 April 2012 at Almondvale Stadium in Livingston. It was the 21st final of the Scottish Challenge Cup since it was first organised in 1990 to celebrate the centenary of the Scottish Football League.

Maltese presidential election, 2014

An indirect presidential election was held in Malta on 1 April 2014. Labour Party MP and Minister of the Family and Social Solidarity Marie-Louise Coleiro Preca was unanimously elected to become the next President of Malta on 4 April 2014.

Malta

2014 Wisconsin spring election

On April 1, 2014, Wisconsin held its spring election. The ballot covered local offices, three Wisconsin Court of Appeals seats and 41 circuit court seats. No Wisconsin Supreme Court seat was up for election.

This records the spring election, separate from the November general election.

United States

Battle of Nasib Border Crossing

The Battle of Nasib Border Crossing was a battle on 1 April 2015 during the Syrian Civil War that resulted in anti-government rebels capturing the Nasib Border Crossing, the last Syria government-held border crossing with Jordan.

Syria

US Marine Corps aircraft land at Tainan

Two US Marine Corps F/A-18 aircraft made an unscheduled landing at Tainan air base in Taiwan after one developed a mechanical problem.

Taiwan

NXT TakeOver: Dallas

NXT TakeOver: Dallas was a professional wrestling show in the NXT TakeOver series that took place on April 1, 2016, produced by WWE, showcasing its NXT division, and was streamed live on the WWE Network. It took place in the Kay Bailey Hutchison Convention Center in Dallas, Texas, as part of the WrestleMania 32 weekend festivities. It was the first show in the NXT TakeOver series to be broadcast live on the WWE Network during WrestleMania weekend and first of 2016. It was also notable for Shinsuke Nakamura's WWE debut match.

Dallas, United States · Texas, United States

2016 Nagorno-Karabakh conflict

The 2016 Nagorno-Karabakh conflict, also known as the Four-Day War, April War, or April clashes, began along the former Nagorno-Karabakh line of contact on 1 April 2016 with the Artsakh Defence Army, backed by the Armenian Armed Forces, on one side and the Azerbaijani Armed Forces on the other. The clashes occurred in a region that is disputed between the self-proclaimed Republic of Artsakh and the Republic of Azerbaijan.

The 2016 Nagorno-Karabakh conflict, also known as the Four-Day War, April War, or April clashes, began along the former Nagorno-Karabakh line of contact on 1 April 2016 with the Artsakh Defence Army, backed by the Armenian Armed Forces, on one side and the Azerbaijani Armed Forces on the other.

2017 Myanmar by-elections

The 2017 Myanmar by-elections were held on 1 April 2017. The elections were held to fill 19 vacant parliamentary seats: nine in the Pyithu Hluttaw, three in the Amyotha Hluttaw, and seven in regional parliaments of Kayah State Hluttaw and Shan State Hluttaw. The seats were left by those who became government leaders or officials after the 2015 general election, or unable to be held due to instability at that time.

Myanmar

NXT TakeOver: Orlando

NXT TakeOver: Orlando was a 2017 professional wrestling livestreaming event produced by WWE, held exclusively for wrestlers from the promotion's developmental brand, NXT. It was the 14th NXT TakeOver event and took place on Saturday, April 1, 2017, at the Amway Center in Orlando, Florida. It was held as part of the WrestleMania 33 weekend festivities and aired exclusively on the WWE Network.

Florida, United States

Supercard of Honor XI

Supercard of Honor XI was the 11th Supercard of Honor professional wrestling pay-per-view event produced by American promotion Ring of Honor (ROH). It took place Saturday, April 1, 2017, at the Lakeland Center (Jenkins Arena) in Lakeland, Florida. With an attendance of 3,500, the event set a new ROH attendance record.

Florida, United States

2017 Coupe de la Ligue final

The 2017 Coupe de la Ligue final was the 23rd final of France's football league cup competition, the Coupe de la Ligue, a competition for the 42 teams that the Ligue de Football Professionnel (LFP) manages. The final took place on 1 April 2017 at the Parc Olympique Lyonnais in Décines-Charpieu and was contested by Monaco and reigning champions Paris Saint-Germain.

Establishment of Xiong'an

Xiong'an New Area is a state-level new area in the Baoding area of Hebei, China. Established in April 2017, the area is located about 100 kilometers (62 mi) south of Beijing and 50 kilometers (31 mi) east of downtown Baoding. Its main function is to serve as a development hub for the Beijing-Tianjin-Hebei (Jing-Jin-Ji) economic triangle.

Battle of Akabar

The battle of Akabar took place on April 1, 2018, between French and Malian forces aided by Tuareg rebels against Jama'at Nasr al-Islam wal Muslimin and the Islamic State in the Greater Sahara.

Mali

2018 African Union base attack in Bulo Marer

On 1 April 2018, Al-Shabaab fighters attacked an AMISOM base in Bulo Marer in the Lower Shebelle region of Somalia.

Somalia

2018 Santosh Trophy final

The 2018 Santosh Trophy final was a match between Kerala and West Bengal, played on 1 April 2018, at the Salt Lake Stadium in Kolkata, West Bengal. The match was a culmination of the 2017–18 Santosh Trophy, the 72nd edition of the football competition contested by regional state associations and government institutions under the All India Football Federation. Kerala won the match after defeating West Bengal in a penalty shootout 4–2.

India

2018 Costa Rican general election

General elections were held in Costa Rica in 2018 to elect both the President and Legislative Assembly. The first round of the presidential election was held on 4 February 2018, with the two highest-ranked candidates being Christian singer and Congressman Fabricio Alvarado Muñoz from the conservative National Restoration Party and writer and former Minister Carlos Alvarado from the progressive Citizens' Action Party, gaining 24% and 21% of the votes respectively.

This entry records the second round, as dated in the source infobox.

Costa Rica

2017–18 Tunisian Super Cup

The 2017–18 Tunisian Super Cup was the 14th edition of the Tunisian Super Cup, a football match contested by the winners of the 2017–18 Tunisian Ligue Professionnelle 1 and 2017–18 Tunisian Cup competitions. The match was played on April 1, 2019, at Abdullah bin Khalifa Stadium in Doha, Qatar, between 2017 and 2018 Ligue Professionnelle 1 winners, Espérance de Tunis, and CA Bizertin, semifinalist of the 2017–18 Tunisian Cup, as an alternative to Club Africain, the winners of said tournament.

Doha, Qatar

Nandigram in the 2021 West Bengal Legislative Assembly election

An Assembly election for the Nandigram Vidhan Sabha constituency in the Indian state of West Bengal was held on 1 April 2021, as part of the 2021 West Bengal Legislative Assembly election for 292 constituencies out of the 294 constituencies. On 2 May, the results were announced, and Suvendu Adhikari defeated Mamata Banerjee by 1956 votes.

India

WWE Hall of Fame (2021)

The 2021 WWE Hall of Fame was a professional wrestling event produced by WWE that featured the induction of the 21st and 22nd classes to the WWE Hall of Fame. Due to the COVID-19 pandemic, the 2020 Hall of Fame ceremony did not occur—as a result, the originally announced Class of 2020 was inducted alongside the Class of 2021 at the 2021 induction ceremony. The event was taped on March 30 and April 1, 2021, at the WWE ThunderDome, hosted at Tropicana Field in St.

MLW Azteca Underground

Azteca Underground was a professional wrestling supercard event produced by Major League Wrestling (MLW), which took place on April 1, 2022, at Gilley's Dallas in Dallas, Texas. The event was a television taping for MLW Fusion on MLW's YouTube channel; the main event aired as part of the Rise of the Renegades special on June 9, 2022.

Dallas, United States

WWE Hall of Fame (2022)

The 2022 WWE Hall of Fame was a professional wrestling event produced by WWE that featured the induction of the 23rd class into the WWE Hall of Fame. The ceremony took place on April 1, 2022, at the American Airlines Center in Dallas, Texas, the night preceding WrestleMania 38. It aired live at 10pm Eastern Time on Peacock in the United States and the WWE Network internationally, immediately after the airing of WWE's regular Friday night program, SmackDown.

Dallas, United States

Battle of Hostomel

During the Russian invasion of Ukraine, a military engagement was fought for control over the town of Hostomel between the Russian and Ukrainian armed forces. As part of an offensive on Kyiv, the Russian forces sought control over Hostomel, Bucha and Irpin in order to encircle and besiege the Ukrainian capital city Kyiv from the west.

This entry records the event's end date, as given in the source infobox.

Ukraine

Battle of Izium

On the eastern front of the Russian invasion of Ukraine, a military engagement began in March 2022 between Russian and Ukrainian forces took place for control over the city of Izium, an important transportation node. The Russian military wanted to capture Izium so its forces in Kharkiv Oblast could link up with their troops in the Donbas region.

This entry records the event's end date, as given in the source infobox.

Ukraine

2023 Aston by-election

The 2023 Aston by-election was held on 1 April 2023 to elect the next member of the Australian House of Representatives in the electorate of Aston in Victoria. The by-election was triggered by the resignation of Liberal MP Alan Tudge on 17 February 2023. The ABC's Antony Green called Aston for Labor candidate Mary Doyle at 8:16pm AEDT.

Australia

NXT Stand & Deliver (2023)

The 2023 NXT Stand & Deliver was a professional wrestling event produced by WWE. It was the third annual Stand & Deliver held for the promotion's developmental brand NXT. The event took place on April 1, 2023, at Crypto.com Arena in Los Angeles, California and aired via WWE's livestreaming platforms. The event was held as a part of WrestleMania Weekend, being held the same day as WrestleMania 39 Night 1 with a special start time of 1 p.m.

California, United States

PFL 1 (2023)

The PFL 1 mixed martial arts event for the 2023 season of the Professional Fighters League was held on April 1, 2023, at The Theater at Virgin Hotels in Las Vegas, Nevada, United States. This marked the first regular-season event of the tournament and included fights in the Featherweight and Light Heavyweight divisions.

Las Vegas, United States

2023 in Rizin Fighting Federation

The year 2023 was the ninth year in the history of the Rizin Fighting Federation, a mixed martial arts promotion based in Japan.

Shwe Kokko offensive

The Shwe Kokko Offensive was a failed offensive by Karen EAOs and the People's Defense Force (including rogue elements of the KNU/KNLA Peace Council and Kawthoolei Army splinter group) on the city of Shwe Kokko.

This entry records the event's start date, as given in the source infobox.

Myanmar

2025 Wisconsin Supreme Court election

The 2025 Wisconsin Supreme Court election was held on April 1, 2025, to elect a justice of the Wisconsin Supreme Court for a ten-year term. Dane County circuit judge Susan M. Crawford defeated Waukesha County circuit judge and former state attorney general Brad Schimel, maintaining the liberal 4–3 majority on the court. Crawford was sworn in on August 1, 2025.

Wisconsin, United States

2025 Anchorage municipal election

Citizens of Anchorage, Alaska voted on fifteen ballot propositions on April 1, 2025, which were approved by the Anchorage Assembly, as well as six Assembly seats.

Alaska, United States

2025 Winnebago County, Wisconsin Executive election

The 2025 Winnebago County, Wisconsin Executive election took place on April 1, 2025, following a primary election on February 18, 2025. Incumbent County Executive Jon Doemel ran for re-election to a second term. He was challenged by two opponents: former State Representative Gordon Hintz and County Sheriff John Matz. Hintz placed first in the primary election by a wide margin, winning 50 percent of the vote, while Doemel placed second with 27 percent and advanced to the general election.

Wisconsin, United States

2025 Florida's 1st congressional district special election

The 2025 Florida's 1st congressional district special election was held on April 1, 2025, to fill a vacant seat in Florida's 1st congressional district previously occupied by Matt Gaetz, who resigned on November 13, 2024, after president-elect Donald Trump nominated him for attorney general of the United States. Gaetz later withdrew his nomination for attorney general on November 21. The following day, Gaetz announced he would not return to Congress.

Florida, United States

2025 Wisconsin Superintendent of Public Instruction election

The 2025 Wisconsin Superintendent of Public Instruction election was a state-wide election held on April 1, 2025, to elect the Superintendent of Public Instruction of Wisconsin for a four-year term. The incumbent superintendent, Jill Underly, was elected to her second four-year term, defeating education consultant Brittany Kinser. Although the election is technically nonpartisan, Underly received support from the Democratic Party of Wisconsin and Kinser received support from the Republican Party of Wisconsin.

Wisconsin, United States

2025 Florida's 6th congressional district special election

The 2025 Florida's 6th congressional district special election was held on April 1, 2025, to choose a new member of the U.S. House of Representatives. The seat became vacant following the resignation of Republican incumbent Mike Waltz, who in 2024 had been re-elected with 66.5% of the vote, but was chosen by President Donald Trump to be his White House national security advisor.

Florida, United States

2025 Wisconsin elections

The 2025 Wisconsin spring election was held in the U.S. state of Wisconsin on April 1, 2025. The race seen as most significant was an open seat on the Wisconsin Supreme Court, which became the most expensive judicial race in history. The election also included a state-wide race for Superintendent of Public Instruction. Several other nonpartisan local and judicial offices were also on the ballot, as were many local school funding referendums.

Wisconsin, United States

2025 Dane County Executive election

The 2025 Dane County executive election was held on April 1, 2025. Incumbent County Executive Melissa Agard, who had just been elected months earlier in a 2024 special election, ran for re-election to a full term. Agard's only opponent was salesman Stephen Ratzlaff, a former State Assembly candidate.

Wisconsin, United States

Strait Thunder-2025A

The Strait Thunder–2025A (Chinese: 海峽雷霆-2025A) was a military exercise organized by the Eastern Theater Command of the People's Liberation Army of the People's Republic of China from 1–2 April 2025, involving the command's land, sea, air, and rocket forces. The exercise was conducted in the vicinity of the Matsu Islands and the main island of Taiwan. The drill on 2 April was held in the central and southern parts of the Taiwan Strait.

This entry records the event's start date, as given in the source infobox.

The Artemis II lunar flyby mission launches, marking the first crewed flight above low Earth orbit since Apollo 17 in 1972

Artemis II (April 1–11, 2026) was a crewed flyby of the Moon and first crewed flight of the NASA-led Artemis program. It was the first crewed flight beyond low Earth orbit (LEO) since Apollo 17 in 1972 and the only crewed flight beyond LEO not part of the Apollo program. It was the first crewed flight of the Space Launch System (SLS) and of the Orion spacecraft, named Integrity by the four-person crew.