2009 - Pringle Fisher, 70, British rugby and basketball player, complications from rheumatoid arthritis.
2009 - Tim Curry, 70, American attorney, District Attorney for Tarrant County, Texas, (1972–2009), lung cancer.
1184 - Greeks enter Troy using the Trojan Horse (traditional).
1479 - Thutmose III ascends to the throne of Egypt, although power effectively shifts to Hatshepsut (according to the Low Chronology of the 18th Dynasty).
1558 - Mary Queen of Scots marries the Dauphin of France, François, at Notre Dame de Paris.
1704 - The first regular newspaper in the United States, the Boston, Massachusetts New-Letter, is published.
1800 - The United States Library of Congress is established when President John Adams signs legislation to appropriate $5,000 USD to purchase "such books as may be necessary for the use of Congress".
1862 - American Civil War: A flotilla commanded by Union Admiral David Farragut passes two Confederate forts on the Mississippi River on its way to capture New Orleans, Louisiana.
1877 - Russo-Turkish War, 1877–1878: Russia declares war on Ottoman Empire.
1898 - The Spanish-American War: The United States declare war on Spain.
1907 - Hersheypark, founded by Milton S. Hershey for the exclusive use of his employees, is opened.
1913 - The skyscraper Woolworth Building in New York City is opened.
1915 - The Armenian Genocide begins with a massacre of hundreds of prominent Armenians in Constantinople (now Istanbul).
1916 - Easter Rising begins: The Irish Republican Brotherhood led by nationalists Patrick Pearse, James Connolly, and Joseph Plunkett start a rebellion in Ireland.
1918 - First tank-to-tank combat, at Villers-Bretonneux, France, when three British Mark IVs met three German A7Vs.
1926 - The Treaty of Berlin under which Germany and the Soviet Union each pledged neutrality in the event of an attack on the other by a third party for the next five years.
1953 - Winston Churchill is knighted by Queen Elizabeth II of the United Kingdom.
1955 - The Bandung Conference ends: Twenty-nine non-aligned nations of Asia and Africa finish a meeting that condemns colonialism, racism, and the Cold War.
1961 - The 17th century Swedish ship Vasa is salvaged.
1963 - Marriage of Her Royal Highness Princess Alexandra of Kent to Angus Ogilvy at Westminster Abbey in London.
1964 - Mexico becomes a signatory to the Buenos Aires copyright treaty.
1965 - Civil war breaks out in the Dominican Republic when Colonel Francisco Caamaño, overthrows the triumvirate that was in power since the coup d'état against Juan Bosch.
1967 - Cosmonaut Vladimir Komarov dies in Soyuz 1, when the parachute fails to open. He is the first human to die during a space mission.
1967 - Vietnam War: American General William Westmoreland says in a news conference that the enemy had "gained support in the United States that gives him hope that he can win politically that which he cannot win militarily."
1968 - Mauritius becomes a member state of the United Nations.
1970 - The first Chinese satellite, Dong Fang Hong I, is launched.
1970 - The Gambia becomes a republic within the Commonwealth of Nations, with Dawda Jawara as the first President.
1975 - The Baader-Meinhof Gang takes 13 hostages at theWest German embassy in Stockholm.
1980 - Eight U.S. servicemen die in Operation Eagle Claw as they attempt to end the Iran hostage crisis.
1990 - STS-31: The Hubble Space Telescope is launched by the Space Shuttle Discovery. Shuttle mission STS-31 lifts off, carrying Hubble into orbit.1990
1991 - Freddie Stowers is awarded the posthumous Medal of Honor for which he had been recommended in 1918.
1993 - The 73rd Constitutional Amendment Act comes into force establishing Panchayati Raj system in India.
1993 - An IRA bomb devastates the Bishopsgate area of London.
1996 - In the United States, the Antiterrorism and Effective Death Penalty Act of 1996 is introduced.
2004 - The United States lifts economic sanctions imposed on Libya 18 years previously, as a reward for its cooperation in eliminating weapons of mass destruction.
2005 - Cardinal Joseph Ratzinger is inaugurated as the 265th Pope of the Roman Catholic Church taking the name Pope Benedict XVI.
2007 - Iceland announces that Norway will shoulder the defense of Iceland during peacetime.
2009 - Ongoing – 2009 swine flu outbreak: The World Health Organization expresses concern at the spread of influenza from Mexico and United States to other countries. By April 27 confirmed cases are also reported in Canada, the United Kingdom and Spain and unconfirmed cases in 15 other countries. Of the 149 deaths (all in Mexico) 20 are confirmed as being from a new strain of H1Ni influenza.
2013 - An eight-story commercial building collapses in Savar Upazila near the Bangladeshi capital of Dhaka, leaving 1,127 dead, 2,500 injured and scores more trapped. The accident is the world's deadliest structural collapse and the third-worst industrial disaster in history.