Year 1051 » Henry I of France is married to Anne of Kiev.
Year 1445 » John II of Castile defeats the Infantes of Aragon at the First Battle of Olmedo.
Year 1499 » Catherine of Aragon is Proxy marriage or married by proxy to Arthur, Prince of Wales. Catherine is 13 and Arthur is 12.
Year 1536 » Anne Boleyn, the second wife of Henry VIII of England, is beheaded for adultery, treason, and incest.
Year 1542 » The Prome Kingdom falls to the Taungoo Dynasty in present-day Burma.
Year 1568 » Queen Elizabeth I of England orders the arrest of Mary, Queen of Scots.
Year 1649 » An Act of Parliament declaring England a Commonwealth of England e.g Commonwealth is passed by the Long Parliament. England would be a republic for the next eleven years.
Year 1655 » The Invasion of Jamaica begins during the Anglo-Spanish War (1654–60) known as Anglo-Spanish War.
Year 1743 » Jean-Pierre Christin developed the centigrade temperature scale.
Year 1749 » King George II of Great Britain grants the Ohio Company a charter of land around the forks of the Ohio River.
Year 1776 » American Revolutionary War: A Continental Army garrison surrenders in the Battle of The Cedars.
Year 1802 » Napoleon or Napoleon Bonaparte founds the Legion of Honour.
Year 1828 » U.S. President John Quincy Adams signs the Tariff of 1828 into law, protecting wool manufacturers in the United States.
Year 1848 » Mexican–American War: Mexico ratifies the Treaty of Guadalupe Hidalgo thus ending the war and ceding California, Nevada, Utah and parts of four other modern-day U.S. states to the United States for US$15 million.
Year 1897 » Oscar Wilde is released from Reading Gaol.
Year 1917 » the Norwegian football club Rosenborg BK was founded.
Year 1919 » Mustafa Kemal Atatürk lands at Samsun on the Anatolian Black Sea coast, initiating what is later termed the Turkish War of Independence.
Year 1921 » The United States Congress passes the Emergency Quota Act establishing national quotas on immigration.
Year 1922 » The Young Pioneer Organization of the Soviet Union is established.
Year 1941 » Viet Minh, a communist coalition, formed at Cao Bằng Province, Vietnam.
Year 1942 » World War II: In the aftermath of the Battle of the Coral Sea, Task Force 16 heads to Pearl Harbor.
Year 1943 » World War II: British Prime Minister Winston Churchill and U.S. President Franklin D. Roosevelt set Monday, May 1, 1944 as the date for the Normandy landings ("D-Day"). It would later be delayed over a month due to bad weather.
Year 1950 » A barge containing munitions destined for Pakistan explodes in the harbor at South Amboy, New Jersey, devastating the city.
Year 1950 » Egypt announces that the Suez Canal is closed to Israeli ships and commerce.
Year 1961 » At Silchar Railway Station, Assam, 11 Bengalis die when police open fire on protesters demanding state recognition of Bengali language in the Bengali Language Movement Legacy e.g Bengali Language Movement.
Year 1961 » Venera program: 'Venera 1' becomes the first man-made object to fly-by another planet by passing Venus (the probe had lost contact with Earth a month earlier and did not send back any data).
Year 1971 » Mars probe program: 'Mars 2' is launched by the Soviet Union.
Year 1986 » The Firearm Owners Protection Act is signed into law by U.S. President Ronald Reagan.
Year 1991 » Croatians vote for independence in a Croatian independence referendum, 1991 or referendum.
Year 1997 » The Sierra Gorda biosphere, the most Ecosystem diversity named ecologically diverse region in Mexico, is established as a result of grassroots efforts.
Year 2007 » President of Romania Traian Băsescu survives an Romanian presidential impeachment referendum, 2007 named impeachment referendum and returns to office from suspension.
Year 2010 » The Royal Thai Armed Forces concludes its 2010 Thai military crackdown known as crackdown on 2010 Thai political protests e.g protests by forcing the surrender of United Front for Democracy Against Dictatorship leaders.