April 20
April 20 is the 110th day of the year (111th in leap years) in the Gregorian calendar;  255 days remain until the end of the year.

Events
Pre-1600
1303 – The Sapienza University of Rome is instituted by a bull of Pope Boniface VIII.

1601–1900
1653 – Oliver Cromwell dissolves England's Rump Parliament.
1657 – English Admiral Robert Blake destroys a Spanish silver fleet, under heavy fire from the shore, at the Battle of Santa Cruz de Tenerife.
1657   – Freedom of religion is granted to the Jews of New Amsterdam (later New York City).
1752 – Start of Konbaung–Hanthawaddy War, a new phase in the Burmese Civil War (1740–57).
1770 – The Georgian king, Erekle II, abandoned by his Russian ally Count Totleben, wins a victory over Ottoman forces at Aspindza.
1775 – American Revolutionary War: The Siege of Boston begins, following the battles at Lexington and Concord.
1789 – George Washington arrives at Grays Ferry, Philadelphia, while en route to Manhattan for his inauguration.
1792 – France declares war against the "King of Hungary and Bohemia", the beginning of the French Revolutionary Wars.
1800 – The Septinsular Republic is established.
1809 – Two Austrian army corps in Bavaria are defeated by a First French Empire army led by Napoleon at the Battle of Abensberg on the second day of a four-day campaign that ended in a French victory.
1828 – René Caillié becomes the second non-Muslim to enter Timbuktu, following Major Gordon Laing. He would also be the first to return alive.
1836 – U.S. Congress passes an act creating the Wisconsin Territory.
1861 – American Civil War: Robert E. Lee resigns his commission in the United States Army in order to command the forces of the state of Virginia.
1861   – Thaddeus S. C. Lowe, attempting to display the value of balloons, makes record journey, flying 900 miles from Cincinnati to South Carolina.
1862 – Louis Pasteur and Claude Bernard complete the experiment disproving the theory of spontaneous generation.
1865 – Astronomer Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L'Immaculata Concezion.
1876 – The April Uprising begins. Its suppression shocks European opinion, and Bulgarian independence becomes a condition for ending the Russo-Turkish War.
1884 – Pope Leo XIII publishes the encyclical Humanum genus, condemning Freemasonry.
1898 – U.S. President William McKinley signs a joint resolution to Congress for declaration of war against Spain, beginning the Spanish–American War.

1901–present
1902 – Pierre and Marie Curie refine radium chloride.
1908 – Opening day of competition in the New South Wales Rugby League.
1914 – Nineteen men, women, and children participating in a strike are killed in the Ludlow Massacre during the Colorado Coalfield War.
1918 – Manfred von Richthofen, a.k.a. The Red Baron, shoots down his 79th and 80th victims, his final victories before his death the following day.
1922 – The Soviet government creates South Ossetian Autonomous Oblast within Georgian SSR.
1945 – World War II: U.S. troops capture Leipzig, Germany, only to later cede the city to the Soviet Union.
1945   – World War II: Führerbunker: On his 56th birthday Adolf Hitler makes his last trip to the surface to award Iron Crosses to boy soldiers of the Hitler Youth.
1945   – Twenty Jewish children used in medical experiments at Neuengamme are killed in the basement of the Bullenhuser Damm school.
1946 – The League of Nations officially dissolves, giving most of its power to the United Nations.
1961 – Cold War: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.
1968 – English politician Enoch Powell makes his controversial "Rivers of Blood" speech.
1968   – South African Airways Flight 228 crashes near the Hosea Kutako International Airport in South West Africa (now Namibia), killing 123 people.
1972 – Apollo program: Apollo 16 lunar module, commanded by John Young and piloted by Charles Duke, lands on the moon.
1998 – Air France Flight 422 crashes after taking off from El Dorado International Airport in Bogotá, Colombia, killing all 53 people on board.
1999 – Columbine High School massacre: Eric Harris and Dylan Klebold kill 13 people and injure 24 others before committing suicide at Columbine High School in Columbine, Colorado.
2007 – Johnson Space Center shooting: William Phillips barricades himself with a handgun in NASA's Johnson Space Center in Houston, Texas before killing a male hostage and himself.
2008 – Danica Patrick wins the Indy Japan 300 becoming the first female driver in history to win an Indy car race.
2010 – The Deepwater Horizon drilling rig explodes in the Gulf of Mexico, killing eleven workers and beginning an oil spill that would last six months.
2012 – One hundred twenty-seven people are killed when a plane crashes in a residential area near the Benazir Bhutto International Airport near Islamabad, Pakistan.
2013 – A 6.6-magnitude earthquake strikes Lushan County, Ya'an, in China's Sichuan province, killing more than 150 people and injuring thousands.
2015 – Ten people are killed in a bomb attack on a convoy carrying food supplies to a United Nations compound in Garowe in the Somali region of Puntland.
2020 – For the first time in history, oil prices drop below zero, an effect of the 2020 Russia-Saudi Arabia oil price war.
2021 – State of Minnesota v. Derek Michael Chauvin: Derek Chauvin is found guilty of all charges in the murder of George Floyd by the Fourth Judicial District Court of Minnesota.
2023 – SpaceX's Starship rocket, the largest and most powerful rocket ever built, launches for the first time. It explodes 4 minutes into flight.

Births
Pre-1600
1494 – Johannes Agricola, German theologian and reformer (d. 1566)
1544 – Renata of Lorraine, Duchess consort of Bavaria (d. 1602)
1586 – Rose of Lima, Peruvian mystic and saint (d. 1617)

1601–1900
1633 – Emperor Go-Kōmyō of Japan (d. 1654)
1646 – Charles Plumier, French botanist and author (d. 1704)
1650 – William Bedloe, English spy (d. 1680)
1718 – David Brainerd, American missionary (d. 1747)
1723 – Cornelius Harnett, American merchant, farmer, and politician (d. 1781)
1727 – Florimond Claude, Comte de Mercy-Argenteau, Belgian-Austrian minister and diplomat (d. 1794)
1745 – Philippe Pinel, French physician and psychiatrist (d. 1826)
1748 – Georg Michael Telemann, German composer and theologian (d. 1831)
1808 – Napoleon III, French politician, 1st President of France (d. 1873)
1816 – Bogoslav Šulek, Croatian philologist, historian, and lexicographer (d. 1895)
1818 – Heinrich Göbel, German-American mechanic and engineer (d. 1893)
1826 – Dinah Craik, English author and poet (d. 1887)
1836 – Eli Whitney Blake, Jr., American scientist and academic (d. 1895)
1839 – Carol I of Romania, King of Romania (d. 1914)
1840 – Odilon Redon, French painter and illustrator (d. 1916)
1850 – Daniel Chester French, American sculptor, designed the Lincoln statue (d. 1931)
1851 – Alexander Dianin, Russian chemist (d. 1918)
1851   – Siegmund Lubin, Polish-American businessman, founded the Lubin Manufacturing Company (d. 1923)
1860 – Justinien de Clary, French target shooter (d. 1933)
1871 – Sydney Chapman, English economist and civil servant (d. 1951)
1873 – James Harcourt, English character actor (d. 1951)
1875 – Vladimir Vidrić, Croatian poet and lawyer (d. 1909)
1879 – Paul Poiret, French fashion designer (d. 1944)
1882 – Holland Smith, American general (d. 1967)
1884 – Princess Beatrice of Saxe-Coburg and Gotha (d. 1966)
1884   – Oliver Kirk, American boxer (d. 1960)
1884   – Daniel Varoujan, Armenian poet and educator (d. 1915)
1889 – Albert Jean Amateau, Turkish rabbi, lawyer, and activist (d. 1996)
1889   – Prince Erik, Duke of Västmanland (d. 1918)
1889   – Marie-Antoinette de Geuser, French mystic (d. 1918)
1889   – Adolf Hitler, Austrian-born German politician, Führer of Nazi Germany (d. 1945)
1889   – Tonny Kessler, Dutch footballer (d. 1960)
1890 – Maurice Duplessis, Canadian lawyer and politician, 16th Premier of Quebec (d. 1959)
1890   – Adolf Schärf, Austrian soldier and politician, 6th President of Austria (d. 1965)
1891 – Dave Bancroft, American baseball player and manager (d. 1972)
1893 – Harold Lloyd, American actor, comedian, and producer (d. 1971)
1893   – Joan Miró, Spanish painter and sculptor (d. 1983)
1895 – Emile Christian, American trombonist and composer (d. 1973)
1895   – Henry de Montherlant, French essayist, novelist, and dramatist (d. 1972)
1896 – Wop May, Canadian captain and pilot (d. 1952)
1899 – Alan Arnett McLeod, Canadian lieutenant, Victoria Cross recipient (d. 1918)

1901–present
1904 – Bruce Cabot, American actor (d. 1972)
1907 – Miran Bakhsh, Pakistani cricketer (d. 1991)
1907   – Augoustinos Kantiotes, Greek bishop (d. 2010)
1908 – Lionel Hampton, American vibraphone player, pianist, bandleader, and actor (d. 2002)
1910 – Fatin Rüştü Zorlu, Turkish diplomat and politician (d. 1961)
1913 – Mimis Fotopoulos, Greek actor and poet (d. 1986)
1913   – Willi Hennig, German biologist and entomologist (d. 1976)
1914 – Betty Lou Gerson, American actress (d. 1999)
1915 – Joseph Wolpe, South African psychotherapist and physician (d. 1997)
1916 – Nasiba Zeynalova, Azerbaijani actress (d. 2004)
1918 – Kai Siegbahn, Swedish physicist and academic, Nobel Prize laureate (d. 2007)
1919 – Richard Hillary, Australian lieutenant and pilot (d. 1943)
1920 – Frances Ames, South African neurologist, psychiatrist, and human rights activist (d. 2002)
1920   – Clement Isong, Nigerian banker and politician, Governor of Cross River State (d. 2000)
1920   – John Paul Stevens, American lawyer and jurist, Associate Justice of the Supreme Court of the United States (d. 2019)
1923 – Mother Angelica, American nun and broadcaster, founded Eternal Word Television Network (d. 2016)
1923   – Irene Lieblich, Polish-American painter and illustrator (d. 2008)
1923   – Tito Puente, American drummer and producer (d. 2000)
1924 – Nina Foch, Dutch-American actress (d. 2008)
1924   – Leslie Phillips, English actor and producer (d. 2022)
1924   – Guy Rocher, Canadian sociologist and academic
1925 – Ernie Stautner, German-American football player and coach (d. 2006)
1925   – Elena Verdugo, American actress (d. 2017)
1927 – Bud Cullen, Canadian judge and politician, 1st Canadian Minister of Employment and Immigration (d. 2005)
1927   – Phil Hill, American race car driver (d. 2008)
1927   – K. Alex Müller, Swiss physicist and academic, Nobel Prize laureate (d. 2023)
1928 – Robert Byrne, American chess player and author (d. 2013)
1928   – Johnny Gavin, Irish international footballer (d. 2007)
1929 – Harry Agganis, American baseball and football player (d. 1955)
1929   – Bobby Hollander, American film director, actor, and magazine publisher (d. 2002)
1930 – Dwight Gustafson, American composer and conductor (d. 2014)
1930   – Antony Jay, English director and screenwriter (d. 2016)
1931 – Michael Allenby, 3rd Viscount Allenby, English lieutenant and politician (d. 2014)
1931   – John Eccles, 2nd Viscount Eccles, English businessman and politician
1932 – Myriam Bru, French actress
1936 – Lisa Davis, English-American actress
1936   – Pauli Ellefsen, Faroese technician, surveyor, and politician, 6th Prime Minister of the Faroe Islands (d. 2012)
1936   – Pat Roberts, American captain, journalist, and politician
1937 – Jiří Dienstbier, Czech journalist and politician, Czech Minister of Foreign Affairs (d. 2011)
1937   – Harvey Quaytman, American painter and educator (d. 2002)
1937   – George Takei, American actor
1938 – Betty Cuthbert, Australian sprinter (d. 2017)
1938   – Manfred Kinder, German runner
1938   – Eszter Tamási, Hungarian actress (d. 1991)
1939 – Peter S. Beagle, American author and screenwriter
1939   – Gro Harlem Brundtland, Norwegian physician and politician, 22nd Prime Minister of Norway
1939   – Johnny Tillotson, American singer-songwriter
1940 – James Gammon, American actor (d. 2010)
1941 – Ryan O'Neal, American actor
1943 – Alan Beith, English academic and politician
1943   – John Eliot Gardiner, English conductor and director
1944 – Toivo Aare, Estonian journalist and author (d. 1999)
1945 – Michael Brandon, American actor and director
1945   – Olga Karlatos, Greek actress and Bermudian lawyer
1945   – Thein Sein, Burmese general and politician, 8th President of Burma
1945   – Naftali Temu, Kenyan runner (d. 2003)
1945   – Steve Spurrier, American football player and coach
1945   – Mike, American Wyandotte chicken, lived 18 months following decapitation (d. 1947)
1946 – Sandro Chia, Italian painter and sculptor
1947 – Rita Dionne-Marsolais, Canadian economist and politician
1947   – Viktor Suvorov, Russian intelligence officer, historian, and author
1948 – Matthias Kuhle, German geographer and academic (d. 2015)
1949 – Veronica Cartwright, English-American actress
1949   – Toller Cranston, Canadian-Mexican figure skater and painter (d. 2015)
1949   – Massimo D'Alema, Italian journalist and politician, 76th Prime Minister of Italy
1949   – Jessica Lange, American actress
1950 – Steve Erickson, American author and critic
1950   – Alexander Lebed, Russian general and politician (d. 2002)
1950   – N. Chandrababu Naidu, Indian politician, 13th Chief Minister of Andhra Pradesh
1951 – Luther Vandross, American singer-songwriter and producer (d. 2005)
1952 – Louka Katseli, Greek economist and politician
1953 – Sebastian Faulks, English journalist and author
1955 – Donald Pettit, American engineer and astronaut
1955   – Svante Pääbo, Swedish geneticist and Nobel Laureate 
1956 – Beatrice Ask, Swedish politician, Swedish Minister for Justice
1956   – Peter Chelsom, English film director, writer, and actor
1956   – Kakha Bendukidze, Georgian economist and politician (d. 2014)
1958 – Viacheslav Fetisov, Russian ice hockey player and coach
1960 – Debbie Flintoff-King, Australian hurdler and coach
1961 – Don Mattingly, American baseball player, coach, and manager
1961   – Konstantin Lavronenko, Russian actor
1963 – Rachel Whiteread, English sculptor
1964 – John Carney, American football player
1964   – Crispin Glover, American actor and filmmaker
1964   – Andy Serkis, English actor and director
1964   – Rosalynn Sumners, American figure skater
1965 – Kostis Chatzidakis, Greek politician, Ministry of Economy, Infrastructure, Shipping and Tourism
1965   – Léa Fazer, Swiss film director, screenwriter and actress
1966 – David Chalmers, Australian philosopher and academic
1966   – David Filo, American businessman, co-founded Yahoo!
1967 – Mike Portnoy, American drummer and songwriter
1968 – Julia Morris, Australian entertainer
1969 – Felix Baumgartner, Austrian daredevil
1969   – Will Hodgman, Australian politician, 45th Premier of Tasmania
1970 – Shemar Moore, American actor
1971 – Allan Houston, American basketball player
1972 – Carmen Electra, American model and actress
1972   – Stephen Marley, Jamaican-American musician
1973 – Julie Powell, American food writer and memoirist (d. 2022)
1975 – Killer Mike, American rapper
1978 – Carl Greenidge, English cricketer
1980 – Emma Husar, Australian politician
1983 – Miranda Kerr, Australian model
1988 – Brandon Belt, American baseball player
1990 – Jason Behrendorff, Australian cricketer
1991 – Luke Kuechly, American football player
1997 – Alexander Zverev, German tennis player

Deaths
Pre-1600
689 – Cædwalla, king of Wessex (b. 659)
888 – Xi Zong, Chinese emperor (b. 862)
1099 – Peter Bartholomew (b. 1061)
1164 – Antipope Victor IV
1176 – Richard de Clare, 2nd Earl of Pembroke, English-Irish politician, Lord Chief Justice of Ireland (b. 1130)
1248 – Güyük Khan, Mongol ruler, 3rd Great Khan of the Mongol Empire (b. 1206)
1284 – Hōjō Tokimune, regent of Japan (b. 1251)
1314 – Pope Clement V (b. 1264)
1322 – Simon Rinalducci, Italian Augustinian friar
1502 – Mary of Looz-Heinsberg, Dutch noble (b. 1424)
1521 – Zhengde, Chinese emperor (b. 1491)
1534 – Elizabeth Barton, English nun and martyr (b. 1506)
1558 – Johannes Bugenhagen, German priest and theologian (b. 1485)

1601–1900
1643 – Christoph Demantius, German composer and poet (b. 1567)
1703 – Lancelot Addison, English clergyman and educator (b. 1632)
1769 – Chief Pontiac, American tribal leader (b. 1720)
1831 – John Abernethy, English surgeon and anatomist (b. 1764)
1873 – William Tite, English architect, designed the Royal Exchange (b. 1798)
1874 – Alexander H. Bailey, American lawyer, judge, and politician (b. 1817)
1881 – William Burges, English architect and designer (b. 1827)
1886 – Charles-François-Frédéric, marquis de Montholon-Sémonville, French general and diplomat, French ambassador to the United States (b. 1814)
1887 – Muhammad Sharif Pasha, Greek-Egyptian politician, 2nd Prime Minister of Egypt (b. 1826)
1899 – Joseph Wolf, German ornithologist and illustrator (b. 1820)

1901–present
1902 – Joaquim de Sousa Andrade, Brazilian poet and educator (b. 1833)
1912 – Bram Stoker, Anglo-Irish novelist and critic, created Count Dracula (b. 1847)
1918 – Karl Ferdinand Braun, German-American physicist and academic, Nobel Prize laureate (b. 1850)
1927 – Enrique Simonet, Spanish painter and educator (b. 1866)
1929 – Prince Henry of Prussia (b. 1862)
1931 – Sir Cosmo Duff-Gordon, 5th Baronet, Scottish-English fencer and businessman (b. 1862)
1932 – Giuseppe Peano, Italian mathematician and philosopher (b. 1858)
1935 – John Cameron, Scottish footballer and manager (b. 1872)
1935   – Lucy, Lady Duff-Gordon, English fashion designer (b. 1863)
1942 – Jüri Jaakson, Estonian businessman and politician, 6th State Elder of Estonia (b. 1870)
1944 – Elmer Gedeon, American baseball player and pilot (b. 1917)
1945 – Erwin Bumke, Polish-German jurist and politician (b. 1874)
1946 – Mae Busch, Australian actress (b. 1891)
1947 – Christian X of Denmark (b. 1870)
1951 – Ivanoe Bonomi, Italian politician, 25th Prime Minister of Italy (b. 1873)
1961 – Ado Vabbe, Estonian painter (b. 1892)
1967 – Léo-Paul Desrosiers, Canadian journalist and author (b. 1896)
1968 – Rudolph Dirks, German-American illustrator (b. 1877)
1969 – Vjekoslav Luburić, Croatian Ustaše official and concentration camp administrator (b. 1914)
1980 – M. Canagaratnam, Sri Lankan politician (b. 1924)
1982 – Archibald MacLeish, American poet, playwright, and lawyer (b. 1892)
1986 – Sibte Hassan, Pakistani journalist, scholar, and activist (b. 1916)
1991 – Steve Marriott, English singer-songwriter and producer (b. 1947)
1991   – Don Siegel, American director and producer (b. 1912)
1992 – Marjorie Gestring, American springboard diver (b. 1922)
1992   – Benny Hill, English comedian, actor, and screenwriter (b. 1924)
1993 – Cantinflas, Mexican actor, producer, and screenwriter (b. 1911)
1995 – Milovan Đilas, Yugoslav communist, politician, theorist and author (b. 1911)
1996 – Trần Văn Trà, Vietnamese general and politician (b. 1918)
1999 – Rick Rude, American professional wrestler (b. 1958)
2001 – Giuseppe Sinopoli, Italian conductor and composer (b. 1946)
2002 – Alan Dale, American singer (b. 1925)
2003 – Bernard Katz, German-English biophysicist and academic, Nobel Prize laureate (b. 1911)
2004 – Lizzy Mercier Descloux, French musician, singer-songwriter, composer, actress, writer and painter (b. 1956)
2005 – Fumio Niwa, Japanese journalist and author (b. 1904)
2007 – Andrew Hill, American pianist, composer, and bandleader (b. 1931)
2007   – Michael Fu Tieshan, Chinese bishop (b. 1931)
2008 – Monica Lovinescu, Romanian journalist and author (b. 1923)
2010 – Dorothy Height, American educator and activist (b. 1912)
2011 – Tim Hetherington, English photographer and journalist (b. 1970)
2012 – Bert Weedon, English guitarist and songwriter (b. 1920)
2014 – Neville Wran, Australian politician, 35th Premier of New South Wales (b. 1926)
2016 – Victoria Wood, British comedian, actress and writer (b. 1953)
2018 – Avicii, Swedish DJ and musician (b. 1989)
2021 – Idriss Déby, Chadian politician and military officer (b. 1952)
2021   – Monte Hellman, American film director (b.1929)
2021   – Les McKeown, Scottish pop singer (b. 1955)
2022 – Gavin Millar, Scottish film director (b. 1938)

Holidays and observances
Christian feast day:
Agnes of Montepulciano
Beuno
Johannes Bugenhagen (Lutheran)
Theotimos
April 20 (Eastern Orthodox liturgics)
420 (cannabis culture)
UN Chinese Language Day (United Nations)

References
External links

BBC: On This Day

The New York Times: On This Day
Historical Events on April 20