311 – The Diocletianic Persecution of Christians in the Roman Empire ends.
313 – Battle of Tzirallum: Emperor Licinius defeats Maximinus II and unifies the Eastern Roman Empire.
642 – Chindasuinth is proclaimed king by the Visigothic nobility and bishops.
1315 – Enguerrand de Marigny is hanged at the instigation of Charles, Count of Valois.
1492 – Spain gives Christopher Columbus his commission of exploration.
1513 – Edmund de la Pole, Yorkist pretender to the English throne, is executed on the orders of Henry VIII.
1557 – Mapuche leader Lautaro is killed by Spanish forces at the Battle of Mataquito in Chile.
1598 – Juan de Oñate begins the conquest of Santa Fe de Nuevo México.
1598 – Henry IV of France issues the Edict of Nantes, allowing freedom of religion to the Huguenots.
1636 – Eighty Years’ War: Dutch Republic forces recapture a strategically important fort from Spain after a nine-month siege.
1671 – Petar Zrinski, the Croatian Ban from the Zrinski family, is executed.
1789 – On the balcony of Federal Hall on Wall Street in New York City, George Washington takes the oath of office to become the first elected President of the United States.
1803 – Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling the size of the young nation.
1812 – The Territory of Orleans becomes the 18th U.S. state under the name Louisiana.
1838 – Nicaragua declares independence from the Central American Federation.
1863 – A 65-man French Foreign Legion infantry patrol fights a force of nearly 2,000 Mexican soldiers to nearly the last man in Hacienda Camarón, Mexico.
1871 – The Camp Grant massacre takes place in Arizona Territory.
1885 – Governor of New York David B. Hill signs legislation creating the Niagara Reservation, New York’s first state park, ensuring that Niagara Falls will not be devoted solely to industrial and commercial use.
1897 – J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
1900 – Hawaii becomes a territory of the United States, with Sanford B. Dole as governor.
1904 – The Louisiana Purchase Exposition World’s Fair opens in St. Louis, Missouri.
1905 – Albert Einstein completes his doctoral thesis at the University of Zurich.
1925 – Automaker Dodge Brothers, Inc is sold to Dillon, Read & Co. for US$146 million plus $50 million for charity.
1927 – The Federal Industrial Institute for Women opens in Alderson, West Virginia, as the first women’s federal prison in the United States.
1927 – Douglas Fairbanks and Mary Pickford become the first celebrities to leave their footprints in concrete at Grauman’s Chinese Theatre in Hollywood.
1937 – The Commonwealth of the Philippines holds a plebiscite for Filipino women on whether they should be extended the right to suffrage; over 90% would vote in the affirmative.
1938 – The animated cartoon short Porky’s Hare Hunt debuts in movie theaters, introducing Happy Rabbit, an early version of Bugs Bunny.
1939 – The 1939–40 New York World’s Fair opens.
1939 – NBC inaugurates its regularly scheduled television service in New York City, broadcasting President Franklin D. Roosevelt’s N.Y. World’s Fair opening day ceremonial address.
1943 – World War II: The British submarine HMS Seraph surfaces near Huelva to cast adrift a dead man dressed as a courier and carrying false invasion plans.
1945 – World War II: Führerbunker: Adolf Hitler and Eva Braun commit suicide after being married for less than 40 hours. Soviet soldiers raise the Victory Banner over the Reichstag building.
1945 – World War II: Stalag Luft I prisoner-of-war camp near Barth, Germany is liberated by Soviet soldiers, freeing nearly 9000 American and British airmen.
1947 – In Nevada, Boulder Dam is renamed Hoover Dam.
1948 – In Bogotá, Colombia, the Organization of American States is established.
1956 – Former Vice President and Democratic Senator Alben Barkley dies during a speech in Virginia.
1957 – Supplementary Convention on the Abolition of Slavery entered into force.
1961 – K-19, the first Soviet nuclear submarine equipped with nuclear missiles, is commissioned.
1963 – The Bristol Bus Boycott is held in Bristol to protest the Bristol Omnibus Company’s refusal to employ Black or Asian bus crews, drawing national attention to racial discrimination in the United Kingdom.
1966 – The Church of Satan is formed in The Black House, San Francisco.
1973 – Watergate scandal: U.S. President Richard Nixon announces that White House Counsel John Dean has been fired and that other top aides, most notably H. R. Haldeman and John Ehrlichman, have resigned.
1975 – Fall of Saigon: Communist forces gain control of Saigon. The Vietnam War formally ends with the unconditional surrender of South Vietnamese president Dương Văn Minh.
1980 – Beatrix is inaugurated as Queen of the Netherlands following the abdication of Juliana.
1980 – The Iranian Embassy siege begins in London.
1982 – The Bijon Setu massacre occurs in Calcutta, India.
1993 – CERN announces World Wide Web protocols will be free.
1994 – Formula One racing driver Roland Ratzenberger is killed in a crash during the qualifying session of the San Marino Grand Prix run at Autodromo Enzo e Dino Ferrari outside Imola, Italy.
2000 – Canonization of Faustina Kowalska in the presence of 200,000 people and the first Divine Mercy Sunday celebrated worldwide.
2004 – U.S. media release graphic photos of American soldiers abusing and sexually humiliating Iraqi prisoners at Abu Ghraib prison.
2008 – Two skeletal remains found near Yekaterinburg, Russia are confirmed by Russian scientists to be the remains of Alexei and Anastasia, two of the children of the last Tsar of Russia, whose entire family was executed at Yekaterinburg by the Bolsheviks.
2009 – Chrysler files for Chapter 11 bankruptcy.
2009 – Seven civilians and the perpetrator are killed and another ten injured at a Queen’s Day parade in Apeldoorn, Netherlands in an attempted assassination on Queen Beatrix.
2012 – An overloaded ferry capsizes on the Brahmaputra River in India killing at least 103 people.
2013 – Willem-Alexander is inaugurated as King of the Netherlands following the abdication of Beatrix.
2014 – A bomb blast in Ürümqi, China kills three people and injures 79 others.
Births on April 30
1245 – Philip III of France (d. 1285)
1310 – King Casimir III of Poland (d. 1368)
1331 – Gaston III, Count of Foix (d. 1391)
1383 – Anne of Gloucester, English countess, granddaughter of King Edward III of England (d. 1438)
1425 – William III, Landgrave of Thuringia (d. 1482)
1504 – Francesco Primaticcio, Italian painter (d. 1570)
1553 – Louise of Lorraine (d. 1601)
1623 – François de Laval, French-Canadian bishop and saint (d. 1708)
1651 – Jean-Baptiste de La Salle, French priest and saint (d. 1719)
1662 – Mary II of England (d. 1694)
1664 – François Louis, Prince of Conti (d. 1709)
1710 – Johann Kaspar Basselet von La Rosée, Bavarian general (d. 1795)
1723 – Mathurin Jacques Brisson, French zoologist and philosopher (d. 1806)
1758 – Emmanuel Vitale, Maltese commander and politician (d. 1802)
1770 – David Thompson, English-Canadian cartographer and explorer (d. 1857)
1777 – Carl Friedrich Gauss, German mathematician and physicist (d. 1855)
1803 – Albrecht von Roon, Prussian soldier and politician, 10th Minister President of Prussia (d. 1879)
1829 – Ferdinand von Hochstetter, Austrian geologist and academic (d. 1884)
1857 – Eugen Bleuler, Swiss psychiatrist and eugenicist (d. 1940)
1857 – Walter Simon, German banker and philanthropist (d. 1920)
1865 – Max Nettlau, German historian and academic (d. 1944)
1866 – Mary Haviland Stilwell Kuesel, American pioneer dentist (d. 1936)
1869 – Hans Poelzig, German architect, designed the IG Farben Building and Großes Schauspielhaus (d. 1936)
1870 – Franz Lehár, Hungarian composer (d. 1948)
1870 – Dadasaheb Phalke, Indian director, producer, and screenwriter (d. 1944)
1874 – Cyriel Verschaeve, Flemish priest and author (d. 1949)
1876 – Orso Mario Corbino, Italian physicist and politician (d. 1937)
1877 – Léon Flameng, French cyclist (d. 1917)
1877 – Alice B. Toklas, American memoirist (d. 1967)
1878 – Władysław Witwicki, Polish psychologist, philosopher, translator, historian (of philosophy and art) and artist (d. 1948)
1880 – Charles Exeter Devereux Crombie, Scottish cartoonist (d. 1967)
1883 – Jaroslav Hašek, Czech soldier and author (d. 1923)
1883 – Luigi Russolo, Italian painter and composer (d. 1947)
1884 – Olof Sandborg, Swedish actor (d. 1965)
1888 – John Crowe Ransom, American poet, critic, and academic (d. 1974)
1893 – Harold Breen, Australian public servant (d. 1966)
1893 – Joachim von Ribbentrop, German soldier and politician, 14th German Reich Minister for Foreign Affairs (d. 1946)
1895 – Philippe Panneton, Canadian physician, academic, and diplomat (d. 1960)
1896 – Reverend Gary Davis, American singer and guitarist (d. 1972)
1896 – Hans List, Austrian scientist and businessman, founded the AVL Engineering Company (d. 1996)
1897 – Humberto Mauro, Brazilian director and screenwriter (d. 1983)
1900 – Erni Krusten, Estonian author and poet (d. 1984)
1901 – Simon Kuznets, Belarusian-American economist, statistician, and academic, Nobel Prize laureate (d. 1985)
1902 – Theodore Schultz, American economist and academic, Nobel Prize laureate (d. 1998)
1905 – Sergey Nikolsky, Russian mathematician and academic (d. 2012)
1908 – Eve Arden, American actress (d. 1990)
1908 – Bjarni Benediktsson, Icelandic professor of law and politician, 13th Prime Minister of Iceland (d. 1970)
1908 – Frank Robert Miller, Canadian air marshal and politician (d. 1997)
1909 – F. E. McWilliam, Irish sculptor and educator (d. 1992)
1909 – Juliana of the Netherlands (d. 2004)
1910 – Levi Celerio, Filipino pianist, violinist, and composer (d. 2002)
1914 – Charles Beetham, American middle-distance runner (d. 1997)
1914 – Dorival Caymmi, Brazilian singer-songwriter, actor, and painter (d. 2008)
1916 – Paul Kuusberg, Estonian journalist and author (d. 2003)
1916 – Claude Shannon, American mathematician and engineer (d. 2001)
1916 – Robert Shaw, American conductor (d. 1999)
1917 – Bea Wain, American singer (d. 2017)
1920 – Duncan Hamilton, Irish-English race car driver and pilot (d. 1994)
1920 – Tom Moore, British army officer and fundraiser
1921 – Roger L. Easton, American scientist, co-invented the GPS (d. 2014)
1922 – Anton Murray, South African cricketer (d. 1995)
1923 – Percy Heath, American bassist (d. 2005)
1923 – Kagamisato Kiyoji, Japanese sumo wrestler, the 42nd Yokozuna (d. 2004)
1924 – Uno Laht, Estonian KGB officer and author (d. 2008)
1925 – Corinne Calvet, French actress (d. 2001)
1925 – Johnny Horton, American singer-songwriter and guitarist (d. 1960)
1926 – Shrinivas Khale, Indian composer (d. 2011)
1926 – Cloris Leachman, American actress and comedian
1928 – Hugh Hood, Canadian author and academic (d. 2000)
1928 – Orlando Sirola, Italian tennis player (d. 1995)
1930 – Félix Guattari, French psychotherapist and philosopher (d. 1992)
1933 – Charles Sanderson, Baron Sanderson of Bowden, English politician
1934 – Jerry Lordan, English singer-songwriter (d. 1995)
1934 – Don McKenney, Canadian ice hockey player and coach
1937 – Tony Harrison, English poet and playwright
1938 – Gary Collins, American actor and talk show host (d. 2012)
1938 – Juraj Jakubisko, Slovak director and screenwriter
1938 – Larry Niven, American author and screenwriter
1940 – Jeroen Brouwers, Dutch journalist and writer
1940 – Michael Cleary, Australian rugby player and politician
1941 – Stavros Dimas, Greek lawyer and politician, Greek Minister of Foreign Affairs
1941 – Max Merritt, New Zealand-Australian singer-songwriter
1942 – Sallehuddin of Kedah, Sultan of Kedah
1943 – Frederick Chiluba, Zambian politician, 2nd President of Zambia (d. 2011)
1943 – Bobby Vee, American pop singer-songwriter (d. 2016)
1944 – Jon Bing, Norwegian author, scholar, and academic (d. 2014)
1944 – Jill Clayburgh, American actress (d. 2010)
1945 – J. Michael Brady, British radiologist
1945 – Annie Dillard, American novelist, essayist, and poet
1945 – Mimi Fariña, American singer-songwriter, guitarist, and activist (d. 2001)
1945 – Michael J. Smith, American captain, pilot, and astronaut (d. 1986)
1946 – King Carl XVI Gustaf of Sweden
1946 – Bill Plympton, American animator, producer, and screenwriter
1946 – Don Schollander, American swimmer
1947 – Paul Fiddes, English theologian and academic
1947 – Finn Kalvik, Norwegian singer-songwriter and guitarist
1947 – Tom Køhlert, Danish footballer and manager
1947 – Mats Odell, Swedish economist and politician, Swedish Minister for Financial Markets
1948 – Wayne Kramer, American guitarist and singer-songwriter
1948 – Pierre Pagé, Canadian ice hockey player and coach
1948 – Margit Papp, Hungarian athlete
1949 – Phil Garner, American baseball player and manager
1949 – António Guterres, Portuguese academic and politician, 114th Prime Minister of Portugal and 9th Secretary-General of the United Nations
1949 – Karl Meiler, German tennis player (d. 2014)
1952 – Jacques Audiard, French director and screenwriter
1952 – Jack Middelburg, Dutch motorcycle racer (d. 1984)
1953 – Merrill Osmond, American singer and bass player
1954 – Jane Campion, New Zealand director, producer, and screenwriter
1954 – Kim Darroch, English diplomat, UK Permanent Representative to the European Union
1954 – Frank-Michael Marczewski, German footballer
1955 – Nicolas Hulot, French journalist and environmentalist
1955 – David Kitchin, English lawyer and judge
1955 – Zlatko Topčić, Bosnian writer and screenwriter
1956 – Lars von Trier, Danish director and screenwriter
1957 – Wonder Mike, American rapper and songwriter
1958 – Charles Berling, French actor, director, and screenwriter
1959 – Stephen Harper, Canadian economist and politician, 22nd Prime Minister of Canada
1960 – Geoffrey Cox, English lawyer and politician
1960 – Kerry Healey, American academic and politician, 70th Lieutenant Governor of Massachusetts
1961 – Arnór Guðjohnsen, Icelandic footballer
1961 – Isiah Thomas, American basketball player, coach, and sportscaster
1963 – Andrew Carwood, English tenor and conductor
1963 – Michael Waltrip, American race car driver and sportscaster
1964 – Tony Fernandes, Malaysian-Indian businessman, co-founded Tune Group
1964 – Ian Healy, Australian cricketer, coach, and sportscaster
1964 – Lorenzo Staelens, Belgian footballer and manager