4月4日发生过什么？

Roman consul Agrippa Menenius Lanatus celebrates a triumph for a military victory over the Sabines

The consuls were the two highest elected public officials of the Roman Republic (c. 509 BC to 27 BC). Romans considered the consulship the second-highest level of the cursus honorum—an ascending sequence of public offices to which politicians aspired—after that of the censor, which was reserved for former consuls. Each year, the centuriate assembly elected two consuls to serve jointly for a one-year term.

Dong Zhuo has his troops evacuate the capital Luoyang and burn it to the ground

Dong Zhuo () (c. 140s – 22 May 192), courtesy name Zhongying, was a Chinese military general, politician, and warlord who lived in the late Eastern Han dynasty. At the end of the reign of the Eastern Han, Dong Zhuo was a general and powerful minister of the imperial government.

Maya king Uneh Chan of Calakmul sacks rival city-state Palenque in southern Mexico

Scroll Serpent (Uneh Chan) was a Maya ruler of the Kaan kingdom. He ruled from AD 579 to 611. He acceded on 2 September.

King Louis the Pious captures Barcelona from the Moors after a siege of several months

Louis the Pious (Latin: Hludowicus Pius; French: Louis le Pieux; German: Ludwig der Fromme; 778 – 20 June 840), also called the Fair and the Debonaire, was King of the Franks and co-emperor with his father, Charlemagne, from 813. He was also King of Aquitaine from 781. As the only surviving son of Charlemagne and Hildegard, he became the sole ruler of the Franks after his father's death in 814.

Siege of Barcelona (801)

The siege of Barcelona was a military operation by a Carolingian army with the aim of conquering the city of Barcelona, which had been under Muslim control for 80 years. The siege and conquest were part of the expansion of the Marca Hispanica and the constitution of the County of Barcelona by the Carolingians.

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

Spain

Byzantine–Venetian treaty of 1268

In 1268, the Byzantine Empire and the Republic of Venice agreed to temporarily end hostilities which had erupted after the Byzantine recovery of Constantinople by Emperor Michael VIII Palaiologos in 1261. Venice had enjoyed a privileged position in the Constantinople-based Latin Empire established by the Fourth Crusade in 1204, while Palaiologos had allied with Venice's main commercial rival, the Republic of Genoa, against them.

Battle of Arques (1303)

The Battle of Arques was fought on 4 April 1303 in the French city of Arques between the County of Flanders and the Kingdom of France.

Death of the Venetian Doge Tommaso Mocenigo, under whose rule victories were achieved against the Kingdom of Hungary and against the Ottoman Empire at the Battle of Gallipoli (1416)

Tommaso Mocenigo (1343–1423) was doge (chief magistrate) of the Republic of Venice from 1414 until his death.

Queen Elizabeth I knighted Francis Drake for completing a circumnavigation of the world

Sir Francis Drake (c. 1540 – 28 January 1596) was an English explorer and privateer best known for making the second circumnavigation of the world in a single expedition between 1577 and 1580 (being the first English expedition to accomplish this). He is also known for participating in the early English slaving voyages of his cousin, John Hawkins, and John Lovell.

Siege of Uman (1654)

The siege of Uman was conducted the Polish–Lithuanian–Crimean forces against the Cossack garrison of Uman, on 2–4 April 1654.

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

Ukraine

Declaration of Breda

The Declaration of Breda (dated 4 April 1660) was a proclamation by Charles II of England in which he promised a general pardon for crimes committed during the English Civil War and the Interregnum for all those who recognised Charles as the lawful king; the retention by the current owners of property purchased during the same period; religious toleration; and the payment of arrears to members of the army, and that the army would be recommissioned into service under the crown.

Battle of Sideling Hill

The Battle of Sideling Hill (sometimes written Sidling Hill) was an engagement in April 1756, between Pennsylvania Colonial Militia and a band of Lenape warriors who had attacked Fort McCord and taken a number of colonial settlers captive. The warriors were taking their captives back to their base at Kittanning when they were ambushed by the militia, but with the help of reinforcements, the Lenape fought off the militia and escaped.

United States

1781 Rhode Island gubernatorial election

The 1781 Rhode Island gubernatorial election was held on April 4, 1781, in order to elect the governor of Rhode Island. Incumbent Independent governor William Greene won re-election as he ran unopposed. The exact number of votes cast in this election are unknown.

United States

Capture of HMS St. Fermin

The Capture of HMS St. Fermin was a naval engagement that took place off Málaga on 4 April 1781, during the American Revolutionary War. Spanish xebecs San Antonio and San Luis captured the sloop-of-war HMS St. Fermin.

Málaga, Spain

1785 Massachusetts gubernatorial election

A gubernatorial election was held in Massachusetts on April 4, 1785. James Bowdoin, the former president of the Massachusetts Constitutional Convention, received more votes than any of his rivals—Thomas Cushing, the incumbent acting governor, Benjamin Lincoln, the former United States secretary of war, and Oliver Prescott, the judge of the probate court for Middlesex County—but no candidate received a majority of the votes cast.

Massachusetts, United States

1787 Rhode Island gubernatorial election

The 1787 Rhode Island gubernatorial election was an election held on April 4, 1787, to elect the governor of Rhode Island. John Collins beat William Bradford with 72.24% of the vote.

United States

1791 Massachusetts gubernatorial election

A gubernatorial election was held in Massachusetts on April 4, 1791. John Hancock, the incumbent governor, was re-elected against scattering opposition.

Massachusetts, United States

1792 Rhode Island gubernatorial election

The 1792 Rhode Island gubernatorial election was held on April 4, 1792, in order to elect the governor of Rhode Island. Incumbent Anti-Federalist governor Arthur Fenner won re-election as he ran unopposed. The exact number of votes cast in this election are unknown.

United States

Battle of Racławice

The Battle of Racławice (Polish: Bitwa pod Racławicami) was one of the first battles of the Kościuszko Uprising against Russia. It was fought on 4 April 1794 near the village of Racławice in Lesser Poland. The battle site is one of Poland's official national Historic Monuments (Pomnik historii), as designated on 1 May 2004. Its listing is maintained by the National Heritage Board of Poland.

1796 Massachusetts gubernatorial election

The 1796 Massachusetts gubernatorial election was held on April 4. Incumbent Governor Samuel Adams was re-elected to a third term in office over Increase Sumner.

United States

1798 Rhode Island gubernatorial election

The 1798 Rhode Island gubernatorial election was held on April 4, 1798, 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

1803 Massachusetts gubernatorial election

The 1803 Massachusetts gubernatorial election was held on April 4. Federalist Governor Caleb Strong was re-elected to a fourth consecutive one-year term in office, defeating Democratic-Republican Elbridge Gerry again for the fourth time.

United States

1804 Rhode Island gubernatorial election

The 1804 Rhode Island gubernatorial election was held on April 4, 1804, 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

Action of 4 April 1808

The Action of 4 April 1808 was a naval engagement off the coast off Rota near Cadiz, Spain where Royal Naval frigates Mercury, Alceste and Grasshopper intercepted a large Spanish convoy protected by twenty gunboats and a train of batteries close to shore.

Bay of Cádiz, Spain

1808 Massachusetts gubernatorial election

The 1808 Massachusetts gubernatorial election was held on April 4, 1808. Incumbent Democratic-Republican Governor James Sullivan won re-election to a second term, defeating Federalist nominee Christopher Gore.

Massachusetts, United States

1810 Rhode Island gubernatorial election

The 1810 Rhode Island gubernatorial election was held on April 4, 1810, in order to elect the governor of Rhode Island. Incumbent Democratic-Republican governor James Fenner won re-election as he ran unopposed. The exact number of votes cast in this election are unknown.

United States

1814 Massachusetts gubernatorial election

The 1814 Massachusetts gubernatorial election was held on April 4, 1814, in order to elect the governor of Massachusetts. Incumbent Federalist Governor Caleb Strong won re-election against Democratic-Republican candidate Samuel Dexter.

Massachusetts, United States

Battle of Curapalihue

The Battle of Curapalihue (4 April 1817) fought in Chile, was a minor encounter between South American rebels and Spanish royalists, during the South American wars of independence. The result was a defeat for the royalists.

Chile

Second Continental Congress

The Second Continental Congress (1775–1781) was the meeting of delegates from the Thirteen Colonies that united in support of the American Revolution and Revolutionary War, which established American independence from Great Britain. The Congress constituted a new federation that it first named the United Colonies of North America, and in 1776, renamed the United States of America.

The United States Congress, affirming the Second Continental Congress, adopts the flag of the United States with 13 red and white stripes and one star for each state (20 at that time).

1825 Massachusetts gubernatorial election

The 1825 Massachusetts gubernatorial election was held on April 4. Governor William Eustis died in February, leaving Lieutenant Governor Marcus Morton, a Jacksonian Republican, to fill the seat on an acting basis. In the general election, Levi Lincoln Jr., an Adams Republican, had no organized opposition.

United States

1832 Rhode Island gubernatorial election

The 1832 Rhode Island gubernatorial election was held on April 4, 1832, in order to elect the governor of Rhode Island. Incumbent National Republican governor Lemuel H. Arnold won a plurality of the vote against former Democratic-Republican governor James Fenner and incumbent Anti-Masonic Speaker of the Rhode Island House of Representatives William Sprague III.

United States

1836 Connecticut gubernatorial election

The 1836 Connecticut gubernatorial election was held on April 4, 1836. Incumbent governor and Democratic nominee Henry W. Edwards was re-elected, defeating former governor, senator and Whig nominee Gideon Tomlinson with 53.93% of the vote.

Connecticut, United States

William Henry Harrison dies of pneumonia, becoming the first President of the United States to die in office, and setting the record for the briefest administration. Vice President John Tyler succeeds Harrison as President

William Henry Harrison (February 9, 1773 – April 4, 1841) was the ninth president of the United States from March to April 1841. He died 31 days into his term, making him the shortest serving president and the first president to die in office. Immediately after his death, Vice President John Tyler took over, ending the constitutional crisis that had been triggered by the question of presidential succession in the U.S.

1842 Connecticut gubernatorial election

The 1842 Connecticut gubernatorial election was held on April 4, 1842. Former Speaker of the Connecticut House of Representatives and Democratic nominee Chauncey Fitch Cleveland was elected, defeating incumbent governor and Whig nominee William W. Ellsworth with 49.94% of the vote. Cleveland won a plurality of the vote, but fell just short of a majority, by 107 votes.

Connecticut, United States

1849 Rhode Island gubernatorial election

The 1849 Rhode Island gubernatorial election was held on April 4, 1849. Incumbent Whig governor Elisha Harris did not run for re-election. Whig nominee Henry B. Anthony defeated Democratic nominee Adnah Sackett and Free Soil nominee Edward Harris.

Rhode Island, United States

Battle of Tápióbicske

The Battle of Tápióbicske was a battle in the Spring Campaign of the Hungarian War of Independence (1848–1849), fought on 4 April 1849 between the Austrian Empire and the Hungarian Revolutionary Army. The Habsburg forces consisted of the I Corps of the Imperial Army led by Lieutenant Field Marshal Josip Jelačić. The Hungarians deployed I and III Corps led by General György Klapka and General János Damjanich respectively.

1853 Connecticut gubernatorial election

The 1853 Connecticut gubernatorial election was held on April 4, 1853. Incumbent governor and Democratic Party nominee Thomas H. Seymour defeated former state legislator and Whig nominee Henry Dutton and former state legislator and Free Soil nominee Francis Gillette with 51.01% of the vote. Seymour would resign on October 13, 1853, to become Minister to Russia, and Lieutenant Governor Charles H.

Connecticut, United States

1853 Costa Rican general election

General elections were held in Costa Rica on 4 April 1853 to elect a president for a six-year term. Incumbent president Juan Rafael Mora Porras was re-elected to a full term with 91.2% of electoral votes. According to historian Iván Molina, from this election onward and for the following four decades, electoral processes played a largely secondary role in the selection of the president, serving primarily a symbolic function of legitimization.

Costa Rica

1855 Rhode Island gubernatorial election

The 1855 Rhode Island gubernatorial election was held on April 4, 1855, in order to elect the governor of Rhode Island. Incumbent Whig governor William W. Hoppin won re-election against Democratic nominee Americus V. Potter.

United States

1858 East Torrens colonial by-election

The 1858 East Torrens colonial by-election was held on 4 April 1858 to elect one of two members for East Torrens in the South Australian House of Assembly, after sitting member Charles Bonney resigned on 26 January 1858. John Henry Barrow won the by-election unopposed.

1859 Connecticut gubernatorial election

The 1859 Connecticut gubernatorial election was held on April 4, 1859. It was a rematch of the 1858 Connecticut gubernatorial election. Incumbent governor and Republican nominee William Alfred Buckingham defeated former congressman and Democratic nominee James T. Pratt with 51.19% of the vote.

Connecticut, United States

1860 Rhode Island gubernatorial election

A gubernatorial election was held in Rhode Island on April 4, 1860. The Democratic and Conservative candidate William Sprague IV defeated the Republican former member of the Rhode Island House of Representatives from Providence Seth Padelford. At the Republican state convention, Padelford, a Radical Republican, defeated the incumbent governor Thomas G. Turner. Padelford's nomination precipitated a movement by Conservative Republicans, former Whigs, and Democrats to jointly nominate Sprague as the conservative fusion candidate.

United States

1862 Preston by-election

The 1862 Preston by-election was held on 4 April 1862, after the incumbent Conservative MP R. A. Cross resigned to enter a private banking business in Warrington. The by-election was won by the Conservative candidate, Thomas Hesketh. Hesketh was related to two previous MPs for the constituency, both also named Thomas Hesketh, one from the 16th century and one from the 18th.

United Kingdom

1864 Connecticut gubernatorial election

The 1864 Connecticut gubernatorial election was held on April 4, 1864, and the first of two gubernatorial elections in which the Republicans adopted the National Union Party name, as the national party had done during the 1864 presidential election. Incumbent governor and National Union nominee William Alfred Buckingham defeated Democratic nominee Origen S. Seymour with 53.65% of the vote.

Connecticut, United States

1866 Rhode Island gubernatorial election

The 1866 Rhode Island gubernatorial election was held on April 4, 1866, in order to elect the governor of Rhode Island. Republican nominee and former Union Army Major General Ambrose Burnside defeated Democratic nominee Lyman Pierce.

United States

Alexander II of Russia narrowly escapes an assassination attempt by Dmitry Karakozov in the city of Saint Petersburg

Alexander II (29 April 1818 – 13 March 1881) was Emperor of Russia, King of Poland, and Grand Duke of Finland from 2 March 1855 until his assassination on 13 March 1881. He is also known as Alexander the Liberator because of his historic Edict of Emancipation, which officially abolished Russian serfdom in 1861. Crowned on 7 September 1856, he succeeded his father Nicholas I and was succeeded by his son Alexander III.

1870 Connecticut gubernatorial election

The 1870 Connecticut gubernatorial election was held on April 4, 1870. It was the third consecutive contest between the same two major party nominees. Former governor and Democratic nominee James E. English defeated incumbent governor and Republican nominee Marshall Jewell with 50.48% of the vote.

Connecticut, United States

1877 Rhode Island gubernatorial election

The 1877 Rhode Island gubernatorial election was held on April 4, 1877. Republican nominee Charles C. Van Zandt defeated Democratic nominee Jerothmul B. Barnaby with 50.93% of the vote.

Rhode Island, United States

1883 Rhode Island gubernatorial election

The 1883 Rhode Island gubernatorial election was held on April 4, 1883. Republican nominee Augustus O. Bourn defeated Democratic nominee William Sprague IV with 54.48% of the vote.

Rhode Island, United States

1885 FA Cup final

The 1885 FA Cup final was a football match between Blackburn Rovers and Queen's Park on 4 April 1885 at Kennington Oval in London. It was the fourteenth final of the world's oldest football competition, the Football Association Challenge Cup (known in the modern era as the FA Cup). Blackburn had won the Cup in the previous season while Queen's Park were competing in their second final with the previous final being previous year.

London, United Kingdom

Spanish general election, 1886

General elections to the Cortes Generales were held in Spain on 4 April 1886. At stake were all 395 seats in the Congress of Deputies.

Spain

1888 Rhode Island gubernatorial election

The 1888 Rhode Island gubernatorial election was held on April 4, 1888. Republican nominee Royal C. Taft defeated Democratic incumbent John W. Davis with 52.33% of the vote.

Rhode Island, United States

1893 San Diego mayoral election

The 1893 San Diego mayoral election was held on April 4, 1893, to elect the mayor for San Diego. William H. Carlson was elected Mayor with a plurality of the votes.

1893 Chicago mayoral election

In the Chicago mayoral election of 1893, Democrat Carter Harrison III won election, returning him the mayor's office for a (then-record) fifth non-consecutive term as mayor of Chicago. Harrison won a majority of the vote, defeating the Republican nominee, businessman Samuel W. Allerton, by a ten-point margin. He also defeated two third-party candidates: United Citizens nominee DeWitt Clinton Cregier (a previous Democrat mayor) and Socialist Labor Party nominee Henry Ehrenpreis, neither of whom received strong support.

1894 Rhode Island gubernatorial election

The 1894 Rhode Island gubernatorial election was held on April 4, 1894. Incumbent Republican Daniel Russell Brown defeated Democratic nominee David S. Baker with 53.15% of the vote.

Rhode Island, United States

Foyot bombing

The Foyot bombing was a bomb attack carried out on 4 April 1894, in Paris against the Foyot restaurant, located at 33 rue de Tournon, fifty meters from the French Senate building. This attack, which took place during the Ère des attentats (1892–1894), injured four people, including the anarchists Laurent Tailhade and Julia Miahle, when a bomb hidden in a flower pot exploded.

Paris, France

1899 San Diego mayoral election

The 1899 San Diego mayoral election was held on April 4, 1899, to elect the mayor for San Diego. Edwin M. Capps was elected Mayor with a majority of the votes.

1899 Chicago mayoral election

In the Chicago mayoral election of 1899, Democrat Carter Harrison IV was reelected, winning a plurality of the vote and defeating Republican nominee Zina R. Carter, former Illinois governor John Peter Altgeld, as well as several minor candidates by a double-digit margin. The election took place on April 4. Before the election, the two major parties held municipal nominating conventions to determine their nominees.

1899 Wisconsin Supreme Court elections

The 1899 Wisconsin Supreme Court elections were held during Wisconsin's 1899 spring election and featured two elections: a regular election and a special election. In both elections, incumbents were re-elected without opposition.

United States

1900 Rhode Island gubernatorial election

The 1900 Rhode Island gubernatorial election was held on April 4, 1900. Republican nominee William Gregory defeated Democratic nominee Nathan W. Littlefield with 54.33% of the vote.

Rhode Island, United States

Columbus, Ohio mayoral election, 1903

The Columbus mayoral election of 1903 was the 54th mayoral election in Columbus, Ohio. It was held on Saturday, April 4, 1903. Democratic party incumbent mayor John N. Hinkle was defeated by Republican party nominee Robert H. Jeffrey.

Ohio, United States

Two destructive earthquakes strike Bulgaria's Kresna region

Two strong earthquakes struck the Kresna region of Bulgaria on April 4, roughly twenty minutes apart. The first shock occurred in the morning in the Struma River valley between Kresna and Krupnik; a larger shock followed. The article assigns the pair magnitudes of 6.9 and 7.2 on the surface-wave scale, and reports more than 200 deaths. Simitli and Krupnik were destroyed, while Dzhumaya, Bansko and Razlog suffered major damage. The disaster is recorded as a doublet earthquake rather than two unrelated anniversaries. Its epicentres and effects place this event in present-day southwestern Bulgaria.

Kresna region, Bulgaria

1905 Kangra earthquake

The 1905 Kangra earthquake occurred in the Kangra Valley and the Kangra district of the Himachal Pradesh, in India on 4 April 1905. The earthquake measured 7.8 on the surface-wave magnitude scale and killed more than 20,000 people. Apart from this, most buildings in the towns of Kangra, Mcleodganj and Dharamshala were destroyed. The earthquake also had a widespread impact in Jammu and Kashmir particularly in the densely populated Kashmir valley. A total of 7,000 to 8,000 people were killed in Jammu and Kashmir with 4,000 to 5,000 deaths occurring in the Kashmir valley.

India

1905 San Diego mayoral election

The 1905 San Diego mayoral election was held on April 4, 1905, to elect the mayor of San Diego. John L. Sehon was elected mayor with a majority of the votes.

1905 Chicago mayoral election

In the Chicago mayoral election of 1905, Democratic nominee Edward Fitzsimmons Dunne defeated Republican nominee John Maynard Harlan and Socialist nominee John Collins. This was the final regularly scheduled Chicago mayoral election for a two-year term. Subsequent elections have been for four-year terms. The general election took place on April 4. Ahead of the election, both major parties selected their nominees at nominating conventions in February.

1911 Wisconsin Supreme Court election

The 1911 Wisconsin Supreme Court election was held on Tuesday, April 4, 1911, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Incumbent justice Aad J. Vinje (who had been appointed the previous year) was elected without opposition.

Wisconsin, United States

1911 San Diego mayoral election

The 1911 San Diego mayoral election was held on April 4, 1911, to elect the mayor for San Diego. Incumbent Mayor Grant Conard and James E. Wadham received the most votes in the primary election and advanced to the runoff. Wadham was then elected mayor with a majority of the votes.

1911 Chicago mayoral election

In the 1911 Chicago mayoral election, Democrat Carter Harrison IV was elected to his fifth non-consecutive term as mayor, tying the then-record set by his father Carter Harrison Sr. for the most Chicago mayoral election victories. Harrison defeated Republican nominee Charles E. Merriam and Socialist nominee William E. Rodriguez. The election was held on April 4. On February 28, 1911, for the first time, direct primary elections were held.

1916 Wisconsin Supreme Court election

The 1916 Wisconsin Supreme Court election was held on Tuesday, April 4, 1916, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Circuit court judge Franz C. Eschweiler prevailed in a five-candidate race, winning a plurality of the vote. Incumbent first-term justice William H. Timlin did not seek re-election, and would ultimately die soon after the election (shortly before his term would have expired).

Wisconsin, United States

1916 Milwaukee mayoral election

An election for Mayor of Milwaukee was held on April 4, 1916. Incumbent mayor Gerhard Adolph Bading was defeated for re-election by Social-Democratic city attorney Daniel Hoan, who won with 51% of the vote.

1922 Wisconsin Supreme Court special election

The 1922 Wisconsin Supreme Court special election was a special election held on Tuesday, April 4, 1922, to elect a justice to the Wisconsin Supreme Court for a partial term. The election took place after the death of John B. Winslow. Incumbent (appointed) justice Burr W. Jones won election.

Wisconsin, United States

Battle of the Segre

The Battle of the Segre is the collective name of a series of battles that took place along the Segre River between 4 April 1938 and 3 January 1939 during the Spanish Civil War, after the Nationalist Faction had broken the lines of the Spanish Republican Army in the Aragon Offensive. Although seldom mentioned in historical works, it was one of the most protracted battles of the Civil War.

Aragon, Spain

1940 New Zealand Labour Party leadership election

The New Zealand Labour Party leadership election, 1940 was held on 4 April 1940 to choose the fourth leader of the New Zealand Labour Party. The election was won by Wellington Central MP Peter Fraser. It followed the death of incumbent Labour leader and Prime Minister Michael Joseph Savage.

Action of 4 April 1941

The action of 4 April 1941 was a naval engagement fought during the Battle of the Atlantic during the Second World War. A German commerce raider, Thor (Schiff 10 to the Kriegsmarine, Raider E to the British), encountered the British armed merchant cruiser HMS Voltaire and sank her after a short engagement. The German crew rescued the British survivors, some of whom were repatriated and gave an account to the Admiralty.

1942 Copa Ibarguren

The 1942 Copa Ibarguren was the 19th edition of a national cup of Argentina. From this edition onwards, the cup was contested by the winners of Primera División and the Copa Presidente de la Nación (a competition formed by teams from regional leagues). The final was contested by River Plate (1942 Primera División champion), and Liga Cordobesa de Fútbol ("Córdoba League"), champion of the 1942 Copa Presidente.

Argentina

Bombing of Bucharest in World War II

The Bucharest World War II bombings were primarily Allied bombings of railroad targets and those of the Oil Campaign of World War II, but included a bombing by Nazi Germany after the 1944 coup d'état. Bucharest stored and distributed much of Ploiești's refined oil products. The first operation was a sequence of 17 aerial bombardments, starting with the one of April 4, 1944.

Battle of Kassel (1945)

The Battle of Kassel was a four-day struggle between the U.S. Army and the German Army in April 1945 for Kassel, a medium-sized city 140 kilometers northeast of Frankfurt am Main, which also is the second-largest city in Hesse (after Frankfurt). The battle resulted as the U.S. Third Army pushed northeast from the region of Frankfurt and Mainz.

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

Germany

East Pomeranian offensive

The East Pomeranian strategic offensive operation (Russian: Восточно-Померанская наступательная операция) was an offensive by the Soviet Red Army against the German Wehrmacht on the Eastern Front. It took place in Pomerania and West Prussia from 10 February – 4 April 1945.

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

Germany

Cactus Ridge

In the Battle of Okinawa, Cactus Ridge was the name U.S. forces gave to a rise of land approximately 600 yards (550 m) southeast of Mashiki, Okinawa which commanded much of the ground between Uchitomari and Oyama, both of which lie along Highway No. 1. The defense of Cactus Ridge to the west, and The Pinnacle to the east, marked the start of resistance by Japanese land forces on Okinawa.

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

Japan

Greek judge and archeologist Panagiotis Poulitsas is appointed Prime Minister of Greece in the midst of the Greek Civil War

Panagiotis Poulitsas (Greek: Παναγιώτης Πουλίτσας; 9 September 1881 – 16 January 1968) was a Greek judge and archeologist who briefly served as interim Prime Minister of Greece from 4 April 1946 to 18 April 1946. He was born in Geraki, Laconia on 9 September 1881. As President of the Council of State, he took the premiership of an interim government from 4 to 18 April 1946 after the troubled 31 March 1946 elections, which were simultaneous with the reigniting of the Greek Civil War.

Twelve countries sign the North Atlantic Treaty

Representatives of twelve European and North American countries signed the North Atlantic Treaty in Washington, D.C., establishing the framework for NATO. The agreement placed collective defence at the centre of a new transatlantic alliance during the early Cold War. Under Article 5, an armed attack against one member in the treaty's defined area would be considered an attack against all, with each ally taking the action it deemed necessary. The treaty also committed members to peaceful dispute resolution and consultation when their security was threatened. This anniversary marks the signing of the founding agreement, rather than a later accession or military operation.

Washington, D.C., United States — signing venue

1950 Wisconsin Supreme Court special election

The 1950 Wisconsin Supreme Court special election was a special election held on Tuesday, April 4, 1950, to elect a justice to the Wisconsin Supreme Court. Incumbent justice John E. Martin (appointed in 1948 to fill the vacancy created by the death on the bench of Chester A. Fowler) won election, defeating challenger Marshall Peterson.

Wisconsin, United States

Al-Hamma incident

The al-Hamma Incident (Hebrew: תקרית אל-חמה) refers to an event on 4 April 1951 that resulted in the death of seven IDF soldiers at the hands of Syrian military forces. The action occurred during an Israeli attempt to enforce its claimed sovereignty over the demilitarized zone along the Syrian border.

1961 Dallas mayoral election

The 1961 Dallas mayoral election was held on April 4, 1961.

Dallas, United States

1961 Wisconsin Supreme Court election

The 1961 Wisconsin Supreme Court election was held on Tuesday, April 4, 1961 to elect a justice to the Wisconsin Supreme Court for a ten-year term. The April general election was preceded by a nonpartisan primary election on March 7, 1961. Circuit Court judge Myron L. Gordon won election to succeed incumbent justice John E. Martin (who did not seek re-election). He defeated Stewart G.

Wisconsin, United States

1961 Los Angeles mayoral election

The 1961 Los Angeles mayoral election took place on April 4, 1961, with a runoff election on May 31, 1961. Incumbent Norris Poulson was defeated by Sam Yorty, a former U.S. Representative. Municipal elections in California, including Mayor of Los Angeles, are officially nonpartisan; candidates' party affiliations do not appear on the ballot.

1961 United States Senate special election in Texas

The 1961 United States Senate special election in Texas was held on May 27, 1961. The election was held to replace outgoing Senator Lyndon B. Johnson, who had been elected Vice President of the United States. Republican John Tower, who had been the nominee for the regularly scheduled election in 1960, defeated 70 other candidates to become the first Republican to represent Texas in the Senate since Reconstruction in 1877.

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

United States

Bye Bye Birdie, a musical romantic comedy film directed by George Sidney, was released

Bye Bye Birdie is a 1963 American musical romantic comedy film directed by George Sidney from a screenplay by Irving Brecher, based on Michael Stewart's book of the 1960 musical of the same name. It also features songs by composer Charles Strouse and lyricist Lee Adams and a score by Johnny Green. Produced by Fred Kohlmar, the film stars Janet Leigh, Dick Van Dyke, Ann-Margret, Maureen Stapleton, Paul Lynde, Bobby Rydell, Jesse Pearson and Ed Sullivan.

1964 Western Samoan general election

General elections were held in Western Samoa on 4 April 1964, the first since independence in 1962. All candidates ran as independents. Following the elections, Fiamē Mataʻafa Faumuina Mulinuʻu II remained prime minister.

Samoa

Thanh Hóa Bridge

The Thanh Hóa Bridge (Vietnamese: Cầu Hàm Rồng, Hàm Rồng Bridge), spanning the Song Ma river, is situated 3 miles (4.8 km) northeast of Thanh Hóa (), the capital of Thanh Hóa Province in Vietnam. The Vietnamese gave it the nickname Hàm Rồng (Dragon's Jaw). In 1965 during the Vietnam War, it was the objective of many attacks by US Air Force and US Navy aircraft which would fail to destroy the bridge until 1972, even after hundreds of attacks.

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

1967 Chicago mayoral election

The Chicago mayoral election of 1967 was held on April 4, 1967. The election saw Richard J. Daley being elected to a fourth term as mayor. Daley's main opponent was Republican nominee John L. Waner, who he defeated by a landslide 48% margin. The election was preceded by primary elections held on February 28, 1967 to determine the nominees of both the Democratic Party and Republican Party.

Chicago, United States

1967 Wisconsin Supreme Court election

The 1967 Wisconsin Supreme Court election was held on Tuesday, April 4, 1967, to elect a justice to the Wisconsin Supreme Court for a ten-year term. It was preceded by a primary election on March 7, 1967. In the election, Robert W. Hansen defeated incumbent chief justice George R. Currie. The election was the first instance in the state's history in which a chief justice of the Supreme Court was unseated in an election.

Wisconsin, United States

Assassination of Martin Luther King Jr.

Martin Luther King Jr. was an American clergyman and civil rights leader who was fatally shot at the Lorraine Motel in Memphis, Tennessee, on April 4, 1968. King was rushed to St. Joseph's Hospital, where he was pronounced dead at 7:05 p.m. that evening. He was a prominent leader of the Civil Rights Movement and Nobel Peace Prize laureate who was known for his use of nonviolence and civil disobedience. James Earl Ray, a fugitive from the Missouri State Penitentiary, was arrested on June 8, 1968, in London at Heathrow Airport, extradited to the United States, and charged with the crime.

Tennessee, United States

Apollo 6

Apollo 6 (April 4, 1968), also known as AS-502, was the third and final uncrewed flight in the United States' Apollo program and the second test of the Saturn V launch vehicle. The Saturn V's utilization during the mission qualified it for use during human spaceflight, and it was used beginning on Apollo 8 in December 1968.

Death of Martin Luther King Jr.

Martin Luther King Jr. (born Michael King Jr.; January 15, 1929 – April 4, 1968) was an American civil rights activist and Baptist minister who was a prominent leader of the civil rights movement from 1955 until his assassination in 1968. He advanced civil rights for people of color in the United States through the use of nonviolent resistance and civil disobedience against Jim Crow laws and other forms of legalized discrimination, which most commonly affected African Americans.

Operation Homecoming

Operation Homecoming was the return of 591 American prisoners of war (POWs) held by North Vietnam after the Paris Peace Accords, which ended United States involvement in the Vietnam War.

A Lockheed C-141 Starlifter, dubbed the Hanoi Taxi, makes the last flight of Operation Homecoming.

Opening of World Trade Center (1973–2001)

The original World Trade Center (WTC) was a complex of seven buildings in the Financial District of Lower Manhattan in New York City. Built primarily between 1966 and 1975, it was dedicated on April 4, 1973, and was destroyed on September 11, 2001, after two hijacked planes were flown into the towers in a coordinated terrorist attack.

1975 Tan Son Nhut Lockheed C-5 crash

On 4 April 1975, a Lockheed C-5A Galaxy participating in the first mission of Operation Babylift crashed on approach during an emergency landing at Tan Son Nhut Air Base, South Vietnam. The cause was ascribed to loss of flight control due to explosive decompression and structural failure.

Bill Gates and Paul Allen founded Microsoft in Albuquerque, New Mexico, to develop and sell BASIC interpreters for the Altair 8800

Microsoft Corporation is an American multinational technology company headquartered in Redmond, Washington. The company became influential in the rise of personal computers through software like Windows and has since expanded into areas such as Internet services, cloud computing, artificial intelligence, video gaming, and more. A Big Tech company, Microsoft is the largest software company by revenue, one of the most valuable public companies, and one of the most valuable brands globally.

1976 Baden-Württemberg state election

The 1976 Baden-Württemberg state election was held on 4 April 1976 to elect the members of the 6th Landtag of Baden-Württemberg. The incumbent Christian Democratic Union (CDU) government under Minister-President Hans Filbinger was re-elected, retaining its majority.

Baden-Württemberg, Germany

Southern Airways Flight 242 crashes in Georgia

Southern Airways Flight 242 made a forced landing on a highway near New Hope, Georgia, on April 4 after a severe thunderstorm disabled both engines. Hail damaged the aircraft as the crew tried to fly toward Atlanta, and the jet struck roadside structures during its attempted landing. Sixty-three people aboard the aircraft and nine people on the ground died; twenty-two aboard survived. The National Transportation Safety Board concluded that water and hail ingestion, combined with thrust lever movement, caused the engines' loss of power. The crash remains the deadliest aviation accident in Georgia and led to a detailed investigation of weather information and flight decisions.

New Hope, Georgia, United States

Prime Minister Zulfikar Ali Bhutto of Pakistan is executed

Zulfikar Ali Bhutto NPk HPk (5 January 1928 – 4 April 1979) was a Pakistani barrister, and statesman who served as the fourth president of Pakistan from 1971 to 1973, and as the ninth prime minister of Pakistan from 1973 until his overthrow in 1977. He was the founder and first chairman of the Pakistan People's Party (PPP) from 1967 until his execution in 1979.

H-3 airstrike

The H-3 airstrike (Persian: عملیات اچ۳) was a surprise air attack by the Iranian Air Force during the Iran–Iraq War on 4 April 1981 against the Iraqi Air Force's H-3 Air Base in western Iraq. The Iranians destroyed at least 48 Iraqi aircraft on the ground with no losses of their own. Based on the results achieved, it is considered one of the most successful raids in the history of aerial warfare.

STS-6

STS-6 was the sixth NASA Space Shuttle mission and the maiden flight of the Space Shuttle Challenger. Launched from Kennedy Space Center on April 4, 1983, the mission deployed the first Tracking and Data Relay Satellite, TDRS-1, into orbit, before landing at Edwards Air Force Base on April 9, 1983. STS-6 was the first Space Shuttle mission during which a Extravehicular activity was conducted, and hence was the first in which the Extravehicular Mobility Unit (EMU) was used.

Garuda Indonesia Flight 035

Garuda Indonesia Flight 035 was a domestic Garuda Indonesia flight that struck a pylon and crashed on approach to Medan-Polonia Airport on 4 April 1987. Out of the 45 passengers and crew on board, 23 were killed in the accident.

1989 Wisconsin Supreme Court election

The 1989 Wisconsin Supreme Court election was held on April 4, 1989, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Incumbent justice Shirley Abrahamson was re-elected over Ralph Adam Fine. The campaign was described to be a "heated race".

Wisconsin, United States

1989 St. Louis mayoral election

The 1989 St. Louis mayoral election was held on April 4, 1989 to elect the mayor of St. Louis, Missouri. It saw the re-election of Vincent C. Schoemehl to a third term. The election was preceded by party primaries on March 7.

1989 Chicago mayoral special election

The Chicago mayoral election of 1989 saw Democratic nominee Richard M. Daley win election to the remainder of an unexpired mayoral term with a 14% margin of victory. This marked a return for the Daley family to the office of mayor. Daley was elected over Alderman Timothy Evans, the nominee of the newly formed Harold Washington Party, and the Republican nominee Ed Vrdolyak.

Neath by-election, 1991

The Neath by-election, 1991 was a by-election held on 4 April 1991 for the British House of Commons constituency of Neath in Wales. It was won by the Labour Party candidate Peter Hain.

Wales, United Kingdom

Forty-one people are taken hostage inside a Good Guys! Electronics store in Sacramento, California. Three of the hostage takers and three hostages are killed

California is a state in the Western United States that lies on the Pacific Coast. It borders Oregon to the north, and Nevada and Arizona to the east; it also shares an international border with the Mexican state of Baja California to the south. With over 39 million residents across an area of 163,696 square miles (423,970 km2), it is the largest U.S. state by population and third-largest by area.

1991 Merion mid-air collision

On April 4, 1991, a Piper Aerostar propeller-driven aircraft collided in mid-air with a Bell 412 helicopter over Merion Elementary School in Lower Merion Township, a suburb west of Philadelphia, in southeast Pennsylvania. All five people in both aircraft were killed, including United States Senator John Heinz, the sole passenger of the Piper. On the ground, two schoolchildren were killed by falling debris and five people were injured.

WrestleMania IX

WrestleMania IX was a 1993 professional wrestling pay-per-view (PPV) event produced by the World Wrestling Federation (WWF, now WWE). It was the ninth annual WrestleMania and took place on April 4, 1993, at Caesars Palace in Paradise, Nevada in the Las Vegas area. It was the first WrestleMania event held outdoors. WrestleMania IX was built around two main storylines.

Las Vegas, United States · Nevada, United States

KLM Cityhopper Flight 433

KLM Cityhopper Flight 433 was a Saab 340B, registered as PH-KSH, which crashed during an emergency landing on 4 April 1994, resulting in the death of 3 occupants, including the captain. Flight 433 was a routine scheduled flight from Amsterdam, the Netherlands, to Cardiff, Wales, United Kingdom. The accident was caused by inadequate pilot training and a faulty sensor, leading to loss of control during go-around.

Establishment of Netscape

Netscape Communications Corporation (originally Mosaic Communications Corporation) was an American independent computer services company with headquarters in Mountain View, California, and then Dulles, Virginia. Its Netscape web browser was once dominant but lost to Internet Explorer and other competitors in the first browser war, with its market share falling from more than 90 percent in the mid-1990s to less than one percent in 2006.

1995 Brown County, Wisconsin Executive election

The 1995 Brown County, Wisconsin Executive election took place on April 4, 1995. Incumbent County Executive Tom Cuene ran for re-election to a third term. He was challenged by County Supervisor Steve Lasee. Because Cuene and Lasee were the only two candidates to file, the primary election was cancelled and the candidates proceeded to the general election.

Wisconsin, United States

1995 Wisconsin elections

The 1995 Wisconsin Spring Election was held in the U.S. state of Wisconsin on April 4, 1995.

Wisconsin, United States

1995 Colorado Springs mayoral election

The 1995 Colorado Springs mayoral election took place on April 4, 1995, to elect the mayor of Colorado Springs, Colorado. The election was held concurrently with various other local elections. The election was officially nonpartisan. It saw the reelection of incumbent mayor Robert M. Issac to a fifth term.

1995 Chicago mayoral election

The Chicago mayoral election of 1995 resulted in the re-election of Democratic Party nominee incumbent Richard M. Daley over independent candidate Roland Burris, with 359,466 votes to Burris's 217,024. Daley won 60.1% of the total vote, winning by a landslide 24-point margin. The Republican candidate, Raymond Wardingley, fared poorly with only 2.8% of the vote. A fourth-place candidate, Harold Washington Party nominee Lawrence Redmond, won 0.9% of the votes.

CMLL International Gran Prix (1997)

The CMLL International Gran Prix (1997) was a lucha libre, or professional wrestling, tournament produced and scripted by the Mexican professional wrestling promotion Consejo Mundial de Lucha Libre (CMLL; "World Wrestling Council" in Spanish) which took place on April 4, 1997 in Arena México, Mexico City, Mexico, CMLL's main venue. The 1997 International Gran Prix was the fourth time CMLL has held an International Gran Prix tournament since 1994.

Mexico City, Mexico

1998 Coupe de la Ligue final

The 1998 Coupe de la Ligue final was a football match held at Stade de France, Saint-Denis on 4 April 1998, that saw Paris Saint-Germain defeat Bordeaux in a penalty shoot-out.

2000 Wisconsin Supreme Court election

The 2000 Wisconsin Supreme Court election was held on April 4, 2000, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Incumbent justice Diane S. Sykes (who had been appointed in 1999) was re-elected, defeating challenger Louis B. Butler by a wide margin.

Wisconsin, United States

2000 Pennsylvania Democratic presidential primary

The 2000 Pennsylvania Democratic presidential primary took place on April 4, 2000, as one of two primaries on the same day in the Democratic primaries for the 2000 United States presidential election. The Pennsylvania primary was a closed primary, with the state awarding 191 delegates, of whom 186 were pledged delegates allocated on the basis of the primary results.

Pennsylvania, United States

2000 Wisconsin Democratic presidential primary

The 2000 Wisconsin Democratic presidential primary took place on April 4, 2000 as part of the Democratic Party primaries for the 2000 presidential election. The Wisconsin primary was an open primary, with the state awarding 93 delegates to the 2000 Democratic National Convention, of which 77 were pledged delegates allocated on the basis of the results of the primary.

Wisconsin, United States

2000 Milwaukee mayoral election

The 2000 Milwaukee mayoral election was held on April 4, 2000, in order to elect the mayor of Milwaukee. Incumbent mayor John Norquist was re-elected to a fourth term in office.

2000 Wisconsin spring election

On April 4, 2000, Wisconsin held its spring election. The ballot included a contested Wisconsin Supreme Court election, presidential preference primaries for both major parties, and nonpartisan local and judicial offices.

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

United States

2000 Anchorage mayoral election

The 2000 Anchorage mayoral election was held on April 4 and May 2, 2000, to elect the mayor of Anchorage, Alaska. It saw election of George Wuerch. Incumbent mayor Rick Mystrom was term-limited. Proposition 10, passed in 1999, required mayoral candidates to receive 50% of the votes cast in a race to avoid a runoff.

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

Moldovan presidential election, 2001

An indirect presidential election was held in Moldova on 4 April 2001.

Moldova

Angolan Civil War

The Angolan Civil War (Portuguese: Guerra Civil Angolana) was a civil war in Angola, beginning in 1975 and continuing, with interludes, until 2002. The war began immediately after Angola became independent from Portugal in November 1975. It was a power struggle between two former anti-colonial guerrilla movements, the communist People's Movement for the Liberation of Angola (MPLA) and the anti-communist National Union for the Total Independence of Angola (UNITA).

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

Angola

Battle of Najaf (2003)

The Battle of Najaf was a major battle in the 2003 U.S. invasion of Iraq. The first stage of the battle was fought when the U.S. 3rd Infantry Division fought to surround the town. The second stage was fought when soldiers from the U.S. 101st Airborne Division fought to clear and secure the city.

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

Iraq

Battle of Samawah

The Battle of Samawah took place during the 2003 invasion of Iraq as American troops fought to clear the city of Iraqi forces. The city had been bypassed during the advance on Baghdad, leaving the task of clearing it to American paratroopers of the 82nd Airborne Division with mechanized infantry and armor provided by units of the 1st Battalion, 41st Infantry Regiment, and 2-70th Armor Battalions, along with 3rd platoon 59th Chemical Company tasked with finding and removing any potential chemical or biological weapons.

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

Iraq

Battle of the Karbala Gap (2003)

The Battle of the Karbala Gap occurred during the 2003 invasion of Iraq. The Karbala Gap is a 20–25-mile wide strip of land with the Euphrates River to the east and Lake Razazah to the west. This strip of land was recognized by Iraqi commanders as a key approach to Baghdad, and was defended by the Medina and Bakhtnisar Divisions of the Iraqi Republican Guard.

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

Iraq

2003 Wamena incident

The 2003 Wamena incident (Indonesian: Peristiwa Wamena 2003) involved a sweeping operation and forced relocation of civilians around the town of Wamena by the Indonesian Army and the Indonesian National Police following a raid on an armory. The operations lasted for around two months following the raid, displacing thousands of civilians and resulting in the deaths of around fifty civilians from various causes.

Siege of Sadr City

The Siege of Sadr City was a blockade of the Shi'a district of northeastern Baghdad carried out by US and Iraqi government forces in an attempt to destroy the main power base of the insurgent Mahdi Army in Baghdad. The siege began on 4 April 2004 – later dubbed "Black Sunday" – with an uprising against the Coalition Provisional Authority following the government banning of a newspaper published by Muqtada Al-Sadr's Sadrist Movement.

Iraq

2004 National Soccer League grand final

The 2004 National Soccer League Grand Final was held on 4 April 2004 between Parramatta Power and Perth Glory at Parramatta Stadium. Parramatta Power had gained home-ground advantage by beating Perth Glory in the major semi final, while Perth earned their place with a win over Adelaide United in the preliminary final. Perth won the match 1–0, with Nik Mrdja scoring a golden goal in extra time.

2004 Iraq spring fighting

The 2004 Iraq spring fighting was a series of operational offensives and various major engagements during the Iraq War. It was a turning point in the war; with the spring fighting marking the entrance into the conflict of militias and religiously based (Shia and Sunni) militant groups, such as the Shia Mahdi Army.

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

Iraq

Moldovan presidential election, 2005

An indirect presidential election was held in Moldova on 4 April 2005.

Moldova

2005 Ligurian regional election

The Ligurian regional election of 2005 took place on 3–4 April 2005. Claudio Burlando (Democrats of the Left) defeated incumbent Sandro Biasotti (an independent close to Forza Italia).

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

2005 Venetian regional election

The Venetian regional election of 2005 took place on 3–4 April 2005. Giancarlo Galan (Forza Italia, House of Freedoms) was re-elected for the third time in a row President of the Region, but the support for him was diminished by the presence of a third candidate, Giorgio Panto, who picked votes both from the centre-right and the Venetist camps, and of a fourth candidate representing the far right, Roberto Bussinello.

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

2005 Italian regional elections

The Italian regional elections of 2005 were held on 3–4 April. The elections were a major victory (11–2) for the centre-left coalition The Union, led by Romano Prodi. The centre-right coalition, which had been in power at the national level since 2001, was defeated in all the regions it governed except for its strongholds, Lombardy and Veneto.

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

Italy

2005 Apulian regional election

The Apulian regional election of 2005 took place on 3–4 April 2005. Nichi Vendola (Communist Refoundation Party) defeated incumbent Raffaele Fitto (Forza Italia). The success of Vendola came somewhat unexpected. In a Southern Italian Region, expected to be morally conservative, Vendola, a communist and homosexual, defeated Fitto, a conservative Christian democrat. Vendola was the first candidate ever to be appointed by its coalition through a primary election instead of agreements between parties.

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

2005 Lombard regional election

The 2005 Lombard regional election took place on 3–4 April 2005. The 8th term of the Regional Council was chosen. Roberto Formigoni (Forza Italia) was re-elected for the third time in a row President, defeating Riccardo Sarfatti.

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

2005 Campania regional election

The Campania regional election of 2005 took place on 3–4 April 2005. Antonio Bassolino (Democrats of the Left, then Democratic Party) was re-elected defeating Italo Bocchino (National Alliance) by a landslide.

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

2005 Calabrian regional election

The 2005 Calabrian regional election took place on 3–4 April 2005. Agazio Loiero (DL, The Union) was elected President of the Region by a landslide.

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

2005 Piedmontese regional election

The 2005 Piedmontese regional election took place on 3–4 April 2005. Mercedes Bresso of the Democrats of the Left defeated the incumbent Enzo Ghigo of Forza Italia.

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

2005 Emilia-Romagna regional election

The Emilia-Romagna regional election of 2005 took place on 3–4 April 2005. The incumbent President Vasco Errani, a member of the social democratic Democrats of the Left, was re-elected defeating by a landslide Carlo Monaco, the candidate of the centre-right coalition led by Forza Italia.

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

2005 Lazio regional election

The Lazio regional election of 2005 took place on 3–4 April 2005. Piero Marrazzo (Independent of The Union) defeated incumbent Francesco Storace (AN, House of Freedoms). The defeat in Lazio for House of Freedoms was especially important as the centre-right expected to maintain control of the Region. Storace, a leading member in the centre-right, was subsequently granted the status of Minister of Public Health in Berlusconi III Cabinet.

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

2005 Abruzzo regional election

The Abruzzo regional election of 2005 took place on 3–4 April 2005. Ottaviano Del Turco (Italian Democratic Socialists, then Democratic Party) defeated incumbent Giovanni Pace (National Alliance) by a landslide.

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

2005 Marche regional election

The Marche regional election of 2005 took place on 3–4 April 2005. Gian Mario Spacca (The Daisy, then Democratic Party) defeated Francesco Massi (Union of Christian and Centre Democrats, at the time, now member of The People of Freedom) by a landslide.

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

2005 Tuscan regional election

The Tuscan regional election of 2005 took place on 3–4 April 2005. Incumbent Claudio Martini (Democrats of the Left) defeated Alessandro Antichi (Forza Italia) by a landslide.

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

2006 Tulsa mayoral election

The 2006 Tulsa mayoral election was held on April 4, 2006, to elect the mayor of Tulsa, Oklahoma. Partisan primary elections were held on March 7, 2006. Incumbent Republican Bill LaFortune ran for re-election. He was defeated in the general election by Democratic nominee Kathy Taylor, who became the second female mayor of Tulsa after Susan Savage.

2006 Anchorage mayoral election

The 2006 Anchorage mayoral election was held on April 4, 2006, to elect the mayor of Anchorage, Alaska. It saw reelection of Mark Begich. Since Begich had received more than a 45% plurality of the vote, no runoff was necessary. Begich retired as mayor on January 3, 2009, after having been elected to the United States Senate.

Take No Prisoners (2009)

Take No Prisoners (2009) was a professional wrestling pay-per-view event produced by Ring of Honor. It took place on April 4, 2009 at the George R. Brown Convention Center in Houston, Texas, and aired on pay-per-view on June 12, 2009. There were seven matches that took place on the card.

Houston, United States · Texas, United States

2009 Netball Superleague Grand Final

The 2009 Netball Superleague Grand Final featured Team Bath and Galleria Mavericks. Having previously played each other in both the 2006 and 2007 grand finals, this was third final that featured Team Bath and Mavericks. This was Team Bath's third grand final and Mavericks fourth. As with the two previous encounters, it was Team Bath that emerged as winners.

2009 Slovak presidential election

Presidential elections were held in Slovakia in March and April 2009, the country's third direct presidential elections. After no candidate received a majority of the vote in the first round on 21 March, the second round on 4 April saw Ivan Gašparovič become the first Slovak president to be re-elected, defeating opposition candidate Iveta Radičová by 56% to 44%.

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

Slovakia

WWE Hall of Fame (2009)

WWE Hall of Fame (2009) was the event which featured the introduction of the 10th class to the WWE Hall of Fame. The event was produced by World Wrestling Entertainment (WWE) on April 4, 2009, from the Toyota Center in Houston, Texas. The event took place the same weekend as WrestleMania 25. The event was hosted by Jerry Lawler and Todd Grisham.

United States

A magnitude 7.2 earthquake hits south of the Mexico-USA border, killing at least two and damaging buildings across the two countries

The 2010 Baja California earthquake (also known as 2010 Easter earthquake, 2010 Sierra El Mayor earthquake, or 2010 El Mayor–Cucapah earthquake) occurred on April 4 (Easter Sunday) with a moment magnitude of 7.2 and a maximum Mercalli intensity of IX (Violent). The shock originated at 15:40:41 local time (3:40:41 PM PDT) south of Guadalupe Victoria, Baja California, Mexico. The 89-second quake was widely felt throughout northwest Mexico and southern California.

Georgian Airways Flight 834

On 4 April 2011, Georgian Airways Flight 834, a Bombardier CRJ100 passenger jet of Georgian Airways operating a domestic flight from Kisangani to Kinshasa in the Democratic Republic of the Congo (DRC), crashed while attempting to land at Kinshasa Airport. The aircraft, which was chartered by the United Nations, was trying to land during a thunderstorm. Of the 33 people on board, only one person survived.

Democratic Republic of the Congo

M23 rebellion (2012–2013)

The First M23 rebellion was an armed conflict in North Kivu, Democratic Republic of the Congo, that occurred between the March 23 Movement (M23) rebel group and Congolese government forces between 4 April 2012 and 7 November 2013. It ended when a peace agreement was made among eleven African nations, and the M23 troops surrendered in Uganda.

North Kivu, Democratic Republic of the Congo

Supercard of Honor VIII

Supercard of Honor VIII was the 8th Supercard of Honor professional wrestling live event produced by Ring of Honor (ROH), which took place on April 4, 2014, at the John A. Alario Sr.

UFC Fight Night: Mendes vs. Lamas

UFC Fight Night: Mendes vs. Lamas (also known as UFC Fight Night 63) was a mixed martial arts event held on April 4, 2015, at the Patriot Center in Fairfax, Virginia.

2016 Saskatchewan general election

The 2016 Saskatchewan general election, was held on April 4, 2016, to elect members of the Legislative Assembly of Saskatchewan. The Lieutenant Governor dissolved the Legislature on March 8, 2016, setting the election date for April 4. The election resulted in the Saskatchewan Party winning its third majority government.

2016 West Bengal Legislative Assembly election

Legislative Assembly elections were held in 2016 for all 294 seats of the Vidhan Sabha in the Indian state of West Bengal. The All India Trinamool Congress under Mamata Banerjee won 211 seats, and thus returned to power with an enhanced majority. As in the 2011 election, the election was held in six phases, with the first phase divided into two days.

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

India

Pool War

The Pool War was a conflict between the Republic of the Congo and the Ninja militia in the Pool Department in the southeastern part of the country. Tensions grew between Frédéric Bintsamou (also known as Pastor Ntumi) and Congolese president Denis Sassou-Nguesso, after Bintsamou contested modifications to the constitution. Bintsamou was formerly a collaborator of Sassou-Nguesso. Between April 2016 and April 2017, a total of 115 people died in the conflict.

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

Republic of the Congo

2017 Wisconsin elections

The 2017 Wisconsin Spring Election was held in the U.S. state of Wisconsin on April 4, 2017. The top of the ballot was the election for state Superintendent of Public Instruction. There was also an uncontested election for Wisconsin Supreme Court, three uncontested elections for Wisconsin Court of Appeals, and several other nonpartisan local and judicial elections. There were also a number of local referendums for school funding.

Wisconsin, United States

Khan Shaykhun chemical attack

The Khan Shaykhun chemical attack took place on 4 April 2017 on the town of Khan Shaykhun in the Idlib Governorate of Syria. The town was reported to have been struck by an airstrike by government forces followed by massive civilian chemical poisoning. The release of a toxic gas, which included sarin, or a similar substance, killed at least 89 people and injured more than 541, according to the opposition Idlib Health Directorate.

2017 St. Louis mayoral election

The 2017 St. Louis mayoral election was held on April 4, 2017, to elect the mayor of St. Louis, Missouri. Incumbent Mayor Francis Slay chose not to run for reelection. Slay, who was serving his fourth term as mayor, indicated in March 2016 that he would run for reelection, but announced in April 2016 that he would not run for a fifth term.

2017 North Las Vegas mayoral election

The 2017 North Las Vegas mayoral election was held on April 4, 2017, to elect the mayor of North Las Vegas, Nevada. It saw the re-election of John Jay Lee.

2017 Henderson, Nevada mayoral election

The 2017 Henderson mayoral election was held on April 4, 2017, to elect the mayor of Henderson, Nevada. It saw the election of Democrat Debra March.

Rise of the Renegades (2019)

Rise of the Renegades (2019) was a professional wrestling supercard event produced by Major League Wrestling (MLW), which took place on April 4, 2019, at the Melrose Ballroom in Queens, New York City, New York. The event was a television taping for MLW Fusion, with Battle Riot II airing as a live Fusion special the following day.

New York, United States · New York City, United States

Impact Wrestling United We Stand

United We Stand was a professional wrestling internet pay-per-view (iPPV) event produced by Impact Wrestling that took place on April 4, 2019 in Rahway, New Jersey. It was the second event in the 2019 Impact Wrestling pay-per-view schedule. Wrestlers from Lucha Libre AAA Worldwide (AAA) and Lucha Underground – with whom Impact has partnerships with – as well as stars from Major League Wrestling (MLW), Dragon Gate and Wrestle Pro also appeared on the card.

New Jersey, United States

Western Libya campaign

The Western Libya campaign was a military campaign initiated on 4 April 2019 by the Operation Flood of Dignity (Arabic: عملية طوفان الكرامة) of the Libyan National Army (LNA), which represents the Libyan House of Representatives, to capture the western region of Libya and eventually the capital Tripoli held by the United Nations Security Council-recognised Government of National Accord (GNA).

Libya

2019 Newport West by-election

A by-election for the United Kingdom parliamentary constituency of Newport West was held on 4 April 2019, following the death of incumbent Labour Party MP Paul Flynn. Labour candidate Ruth Jones held the seat for the party, albeit with a reduced majority.

Battle of Gharyan (2019)

The Battle of Gharyan, which unfolded from April 2019 to June 2019, was a significant conflict in the ongoing struggle for control in Libya. The opposing forces were the Libyan National Army (LNA), led by General Khalifa Haftar, and the Government of National Accord (GNA), headed by Prime Minister Fayez al-Sarraj.

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

Libya

2020 Tajik Super Cup

The 2020 Tajik Supercup was the 11th Tajik Supercup, an annual Tajik football match played between the winners of the previous season's Tajikistan Higher League and Tajikistan Cup. The match was contested by 2019 League and Cup champions Istiklol, and the league runners-up Khujand. It was held at the Pamir Stadium in Dushanbe on 4 April.

2021 Kosovan presidential election

The parliament of Kosovo held indirect elections for president of Kosovo on 3 and 4 April 2021. The elections successfully concluded after three rounds, with Vjosa Osmani winning 71 votes out of a total possible 120. Three political parties boycotted the vote. Nasuf Bejta, also a member of Guxo, the political party Osmani founded, was the only other candidate who received a vote during any of the other rounds.

Kosovo

Siege of Chernihiv

The Siege of Chernihiv was a military engagement in the city of Chernihiv, in Chernihiv Oblast in the north of Ukraine. It began on 24 February 2022, as part of the northern Ukraine offensive, during the 2022 Russian invasion of Ukraine. On 4 April 2022, Ukrainian authorities stated that the Russian military had left Chernihiv Oblast. The city was about 70% destroyed due to the siege.

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

Ukraine

2023 Wisconsin Supreme Court election

The 2023 Wisconsin Supreme Court election was held on Tuesday, April 4, 2023, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Milwaukee County circuit judge Janet Protasiewicz defeated former Wisconsin Supreme Court justice Daniel Kelly, effectively flipping the ideological balance of the court from a conservative to liberal majority. Incumbent justice Patience D.

Wisconsin, United States

2023 Brown County, Wisconsin Executive election

The 2023 Brown County, Wisconsin Executive election took place on April 4, 2023. Incumbent County Executive Troy Streckenbach ran for re-election to a fourth term. He faced no opposition and was re-elected unopposed.

Wisconsin, United States

2023 Denver mayoral election

The 2023 Denver mayoral election was held on April 4, 2023, to elect the mayor of Denver, Colorado, with a runoff held on June 6. The election was officially nonpartisan and was held concurrently with elections for the Denver City Council, as well as city auditor and city clerk and recorder. Incumbent mayor Michael Hancock was term-limited and could not seek a fourth term in office.

Denver, United States

2023 Wisconsin elections

The 2023 Wisconsin Spring Election was held in the U.S. state of Wisconsin on April 4, 2023. The featured race at the top of the ticket was for an open seat on the Wisconsin Supreme Court, which became the most expensive judicial election in history. Several other nonpartisan local and judicial offices were also decided on the April 4 ballot, including mayoral elections in some of Wisconsin's larger cities—Green Bay, Madison, and Racine.

Wisconsin, United States

2023 Chicago aldermanic election

The 2023 Chicago aldermanic election took place in two rounds on February 28 and April 4, 2023, to elect 50 alderpersons to the Chicago City Council. Each alderperson represents one of Chicago's 50 wards. The elections are non-partisan and use a two-round system where the top two finishers compete in a second-round runoff if no candidate receives more than 50% of the vote in the first round.

2023 Los Angeles special election

The 2023 Los Angeles special election was held on April 4, 2023, with a runoff occurring on June 27, 2023. Voters will elect a candidate in a nonpartisan primary, with runoff elections potentially scheduled. One of the fifteen seats on the Los Angeles City Council was up for election due to the vacancy of one member, councilwoman Nury Martinez of District 6, who resigned in the wake of the 2022 Los Angeles City Council scandal.

2023 Colorado Springs mayoral election

The 2023 Colorado Springs mayoral election was held on April 4, 2023, to elect the mayor of Colorado Springs, Colorado, with a runoff scheduled for May 16. Incumbent mayor John Suthers was term-limited and could not seek a third term in office. The election was officially nonpartisan. A wide field of candidates filed to run in the election, including several members of municipal government.

2023 Springfield, Missouri, mayoral election

Springfield, Missouri held an election for mayor on April 4, 2023. Incumbent mayor Ken McClure faced off against fellow candidate Melanie Bach. McClure was re-elected mayor by a margin of roughly six percentage points, winning 53.18% to Bach’s 46.82%. Springfield mayoral elections are nonpartisan and candidates are not affiliated with a specific party on ballots.

2023 Chicago mayoral election

The 2023 Chicago mayoral election was held on February 28, 2023, to elect the mayor of Chicago, Illinois. With no candidate receiving a majority of votes in the initial round of the election, a runoff election was held on April 4. This two-round election took place alongside other 2023 Chicago elections, including races for City Council, city clerk, city treasurer, and police district councils.

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

2023 St. Louis aldermanic elections

The 2023 St. Louis aldermanic elections were held in two rounds, with nonpartisan blanket approval voting primaries on March 7 and general elections on April 4. All 14 members of the St. Louis Board of Aldermen and the President of the Board of Aldermen were elected. These were the first elections held after Proposition R (2012) came into effect, reducing the number of alderpersons from 28 to 14.

This entry records the listed event date, as dated in the source infobox.

2023 Chicago elections

The 2023 Chicago elections took place in two rounds on February 28, 2023, and April 4, 2023. Elections were held for Mayor of Chicago, City Clerk of Chicago, City Treasurer of Chicago, all 50 members of the Chicago City Council, and 66 members of the newly created police District Councils. The elections were administered by the Chicago Board of Elections.

This entry records the listed event date, as dated in the source infobox.

2024 Belarusian Council of the Republic election

The indirect election to the Council of the Republic of Belarus were held on 4 April 2024.

Belarus

2024 Chabahar and Rask clashes

In the southeastern border province of Sistan and Balochistan, an attack on an Islamic Revolutionary Guard Corps (IRGC) headquarters happened on the night of 4 April 2024. At least 16 Iranian security force members were killed in this attack. The clashes occurred in the towns of Chabahar, Rask and Sarbaz. Jaish ul-Adl, a Sunni armed group, was involved in the attack and lost at least 16 members during the clashes.

Sistan and Baluchestan province, Iran

PFL 1 (2024)

The PFL 1 mixed martial arts event for the 2024 season of the Professional Fighters League was held on April 4, 2024, at the Boeing Center at Tech Port in San Antonio, Texas, United States. This marked the first regular-season event of the tournament and included fights in the Women's Flyweight and Heavyweight divisions.

Texas, United States

Battle of Chasiv Yar

The Battle of Chasiv Yar is a military engagement in the Russo-Ukrainian war between the Russian Armed Forces and the Armed Forces of Ukraine for control of the city of Chasiv Yar and surrounding villages. The battle began on 4 April 2024 with the first direct assault on the city by Russian forces, and has thus far seen the capture of the district east of a canal passing through the city, the crossing of the canal, and the claimed capture of the city as of early August 2025.