On this day: October 20

Events on October 20

• 1740 Under the terms of the Pragmatic Sanction, Maria Theresa ascended the Habsburg throne. Wikipedia
• 1774 American Revolution: The Continental Association, a nonconsumption and nonimportation agreement against the British Isles and the British West Indies, is adopted by the First Continental Congress. Wikipedia
• 1935 The Long March, a mammoth retreat undertaken by the armed forces of the Chinese Communist Party a year prior, ends. Wikipedia
• 1939 Pope Pius XII published his first encyclical, Summi Pontificatus, which critiqued ideologies such as racism, cultural superiority and totalitarianism. Wikipedia
• 1941 World War II: Thousands of civilians in German-occupied Serbia are murdered in the Kragujevac massacre. Wikipedia
• 1944 World War II: Fulfilling a promise he made two years previously, General Douglas MacArthur landed on Leyte to begin the recapture of the Philippines. Wikipedia
• 1944 World War II: American general Douglas MacArthur fulfills his promise to return to the Philippines when he comes ashore during the Battle of Leyte. Wikipedia
• 1944 World War II: The Soviet Red Army and Yugoslav Partisans liberate Belgrade. Wikipedia
• 1947 Cold War: The House Un-American Activities Committee begins its investigation into Communist infiltration of the Hollywood film industry, resulting in a blacklist that prevents some from working in the industry for years. Wikipedia
• 1962 China launches simultaneous offensives in Ladakh and across the McMahon Line, igniting the Sino-Indian War. Wikipedia
• 1969 Experimental results from the Stanford Linear Accelerator Center were published showing that protons were composed of smaller particles, the first evidence of quarks. Wikipedia
• 1973 The Sydney Opera House is opened by Elizabeth II after 14 years of construction. Wikipedia
• 1973 Watergate scandal: Attorney General Elliot Richardson and his deputy William Ruckelshaus resigned after refusing to obey President Richard Nixon's order to have Archibald Cox fired. Wikipedia
• 1973 Watergate scandal: "Saturday Night Massacre": United States President Richard Nixon fires U.S. Attorney General Elliot Richardson and Deputy Attorney General William Ruckelshaus after they refuse to fire special prosecutor Archibald Cox, who is finally fired by Solicitor General Robert Bork. Wikipedia
• 1976 The Luling–Destrehan Ferry MV George Prince is struck by the Norwegian freighter SS Frosta while crossing the Mississippi River in St. Charles Parish, Louisiana. Seventy-eight passengers and crew die, and only 18 people aboard the ferry survive. Wikipedia
• 1977 A plane carrying the rock band Lynyrd Skynyrd crashes in woodland in Mississippi, United States. Six people, including three band members, are killed. Wikipedia
• 1986 Aeroflot Flight 6502 crashed on approach to Kurumoch Airport in Samara, Russia (then Kuybyshev in the Soviet Union), killing 70 people on board. Wikipedia
• 1986 Aeroflot Flight 6502 crashes while landing at Kuibyshev Airport (now Kuromoch International Airport) in Kuibyshev (now present-day Samara, Russia), killing 70 people. Wikipedia
• 1991 An earthquake struck the Indian state of Uttarakhand, killing at least 768 people and destroying thousands of homes. Wikipedia
• 2002 Top Gear, the revived popular British TV motoring magazine, premieres on BBC. Wikipedia
• 2003 The Sloan Great Wall, once the largest cosmic structures known to humanity, is discovered by students at Princeton University. Wikipedia
• 2005 The general conference of the United Nations Educational, Scientific and Cultural Organization (UNESCO) passes the Convention on the Protection and Promotion of the Diversity of Cultural Expressions. Wikipedia
• 2011 First Libyan Civil War: Muammar Gaddafi, the deposed Libyan leader, was captured by rebel forces during the Battle of Sirte, and was killed shortly thereafter. Wikipedia
• 2011 Libyan Crisis: Rebel forces capture Libyan dictator Muammar Gaddafi and his son Mutassim in his hometown of Sirte and kill them shortly thereafter, ending the first Libyan civil war. Wikipedia
• 2017 Syrian civil war: The Syrian Democratic Forces (SDF) declare victory in the Raqqa campaign. Wikipedia
• 2022 Liz Truss steps down as British Prime Minister and leader of the Conservative Party amid the country's political crisis, serving for the least time of any British Prime Minister (49 days). Wikipedia

Born on October 20

• 888 Zhu Youzhen, emperor of Later Liang (died 923) Wikipedia
• 1677 Stanisław Leszczyński, King of Poland (died 1766) Wikipedia
• 1740 Isabelle de Charrière, Dutch author and poet (died 1805) Wikipedia
• 1780 Pauline Bonaparte, French sister of Napoleon (died 1825) Wikipedia
• 1784 Henry John Temple, 3rd Viscount Palmerston, English academic and politician, Prime Minister of the United Kingdom (died 1865) Wikipedia
• 1819 Báb, Iranian religious leader, founded Bábism (died 1850) Wikipedia
• 1854 Arthur Rimbaud, French soldier and poet (died 1891) Wikipedia
• 1859 John Dewey, American psychologist and philosopher (died 1952) Wikipedia
• 1882 Bela Lugosi, Hungarian-American actor (died 1956) Wikipedia
• 1889 Luo Yixiu, first wife of Mao Zedong (died 1910) Wikipedia
• 1890 Aleksander Maaker, Estonian bagpipe player (died 1968) Wikipedia
• 1891 James Chadwick, English physicist and academic, Nobel Prize laureate (died 1974) Wikipedia
• 1942 Christiane Nüsslein-Volhard, German biologist and geneticist, Nobel Prize laureate Wikipedia
• 1946 Elfriede Jelinek, Austrian author and playwright, Nobel Prize laureate Wikipedia
• 1951 Claudio Ranieri, Italian footballer and manager Wikipedia
• 1956 Danny Boyle, English director, producer, and screenwriter Wikipedia
• 1958 Viggo Mortensen, American-Danish actor and producer Wikipedia
• 1964 Kamala Harris, American politician and lawyer, 49th Vice President of the United States Wikipedia
• 1966 Patrick Volkerding, American computer scientist and engineer, founded Slackware Wikipedia
• 1971 Snoop Dogg, American rapper, producer, and actor Wikipedia
• 1971 Dannii Minogue, Australian singer-songwriter and actress Wikipedia
• 1979 John Krasinski, American actor, director, and producer Wikipedia

Died on October 20

• 460 Aelia Eudocia, Byzantine wife of Theodosius II (born 401) Wikipedia
• 1187 Pope Urban III Wikipedia
• 1740 Charles VI, Holy Roman Emperor (born 1685) Wikipedia
• 1935 Arthur Henderson, Scottish-English politician, Secretary of State for Foreign Affairs, Nobel Prize laureate (born 1863) Wikipedia
• 1964 Herbert Hoover, American engineer and politician, 31st President of the United States (born 1874) Wikipedia
• 1984 Paul Dirac, English-American physicist and mathematician, Nobel Prize laureate (born 1902) Wikipedia
• 1984 Carl Ferdinand Cori, Czech-American biochemist and pharmacologist, Nobel Prize laureate (born 1896) Wikipedia
• 1987 Andrey Kolmogorov, Russian mathematician and academic (born 1903) Wikipedia
• 1994 Burt Lancaster, American actor (born 1913) Wikipedia
• 2011 Muammar Gaddafi, Libyan colonel and politician, Prime Minister of Libya (born 1942) Wikipedia
• 2012 John McConnell, American activist, created Earth Day (born 1915) Wikipedia
• 2012 E. Donnall Thomas, American physician and academic, Nobel Prize laureate (born 1920) Wikipedia
• 2013 Lawrence Klein, American economist and academic, Nobel Prize laureate (born 1920) Wikipedia
• 2024 Fethullah Gülen, Turkish preacher and theologian (born 1941) Wikipedia

Holidays and observances

• Christian feast days: Acca of Hexham Wikipedia
• Christian feast days: Aderald Wikipedia
• Christian feast days: Artemius Wikipedia
• Christian feast days: Caprasius of Agen Wikipedia
• Christian feast days: Hedwig (in Canada, moved from Oct. 16) Wikipedia
• Christian feast days: Irene of Tomar Wikipedia
• Christian feast days: Magdalene of Nagasaki Wikipedia
• Christian feast days: Margaret Marie Alacoque (in Canada, moved from Oct. 16) Wikipedia
• Christian feast days: Paul of the Cross (in USA, moved from Oct. 19) Wikipedia
• Christian feast days: Maria Bertilla Boscardin Wikipedia
• Christian feast days: Mater Admirabilis Wikipedia
• Christian feast days: October 20 (Eastern Orthodox liturgics) Wikipedia
• Arbor Day (Czech Republic) Wikipedia
• Heroes' Day (Kenya) Wikipedia
• Revolution Day (Guatemala), one of the two Patriotic Days (Guatemala) Wikipedia
• Vietnamese Women's Day (Vietnam) Wikipedia
• World Osteoporosis Day Wikipedia
• World Statistics Day Wikipedia

The events, births, deaths and observances above are from the English Wikipedia article “October 20” and the articles it links to (authors and history), retrieved 2026-10-09 through the Wikimedia “On this day” feed. They are licensed under CC BY-SA 4.0; this selection is shared under the same licence. We picked the 26 events, 22 births and 14 deaths with the widest coverage across Wikipedia's language editions (counted from Wikidata) and sorted them by year; the wording is unchanged apart from removing references to pictures.