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
• 1803 The United States Senate ratifies the Louisiana Purchase. Wikipedia
• 1827 Greek War of Independence: In the Battle of Navarino, a combined Turkish and Egyptian fleet is defeated by British, French and Russian naval forces in the last significant battle fought with wooden sailing ships. Wikipedia
• 1935 The Long March, a mammoth retreat undertaken by the armed forces of the Chinese Communist Party a year prior, ends. Wikipedia
• 1936 British woman Mabel Freer was refused entry to Australia after failing a dictation test given in Italian, leading to a debate over Australia's immigration policy. Wikipedia
• 1939 Pope Pius XII published his first encyclical, Summi Pontificatus, which critiqued ideologies such as racism, cultural superiority and totalitarianism. 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: The Soviet Red Army and Yugoslav Partisans liberate Belgrade. Wikipedia
• 1951 African-American college football player Johnny Bright was the victim of an on-field assault, eventually leading to changes in NCAA football rules that mandated the use of more protective helmets with face guards. Wikipedia
• 1962 China launches simultaneous offensives in Ladakh and across the McMahon Line, igniting the Sino-Indian War. Wikipedia
• 1967 Roger Patterson and Robert Gimlin filmed an unidentified subject, which they claimed was Bigfoot, at Six Rivers National Forest in California. 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 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 The Sydney Opera House is opened by Elizabeth II after 14 years of construction. Wikipedia
• 1977 Three members of the American rock band Lynyrd Skynyrd died when their chartered plane crashed in Gillsburg, Mississippi. Wikipedia
• 1982 During a UEFA Cup match between Spartak Moscow and Haarlem, a large number of attendees trying to leave the Central Lenin Stadium resulted in a stampede that caused 66 deaths. Wikipedia
• 1984 The Spanish trawler Sonia sank in British waters after a five-hour chase by the Irish Naval Service patrol vessel Aisling, during which almost 600 shots were fired. 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
• 1991 An earthquake struck the Indian state of Uttarakhand, killing at least 768 people and destroying thousands of homes. Wikipedia
• 1995 Space Shuttle Columbia launches on STS-73. Wikipedia
• 2002 Top Gear, the revived popular British TV motoring magazine, premieres on BBC. 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
• 2022 Protests broke out across Chad after President Mahamat Déby declared his intentions to extend his rule by another two years. 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
• 2024 Prabowo Subianto and Gibran Rakabuming Raka were sworn in as president and vice president of Indonesia, becoming the oldest and the youngest person to assume respective offices. Wikipedia

Born on October 20

• 1677 Stanisław Leszczyński, King of Poland (died 1766) Wikipedia
• 1740 Isabelle de Charrière, Dutch author and poet (died 1805) 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
• 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
• 1950 Tom Petty, American singer-songwriter, guitarist, and producer (died 2017) 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
• 1961 Ian Rush, Welsh footballer and manager Wikipedia
• 1963 Julie Payette, Canadian engineer, astronaut, and 29th Governor General of Canada Wikipedia
• 1964 Kamala Harris, American politician and lawyer, 49th Vice President of the United States 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
• 1988 Candice Swanepoel, South African supermodel and philanthropist Wikipedia
• 1992 Mattia De Sciglio, Italian footballer Wikipedia

Died on October 20

• 1187 Pope Urban III Wikipedia
• 1740 Charles VI, Holy Roman Emperor (born 1685) Wikipedia
• 1890 Richard Francis Burton, English-Italian geographer and explorer (born 1821) 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
• 1994 Sergei Bondarchuk, Russian actor and filmmaker (born 1920) Wikipedia
• 2011 Muammar Gaddafi, Libyan colonel and politician, Prime Minister of Libya (born 1942) Wikipedia
• 2016 Junko Tabei, Japanese mountaineer (born 1939) Wikipedia
• 2018 Wim Kok, Dutch prime minister (born 1938) Wikipedia
• 2020 James Randi, Canadian-American stage magician and author (born 1928) 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

Sources

• Wikipedia — “October 20” — events, births, deaths and observances (text under CC BY-SA 4.0) (checked 2026-10-15)
• Wikipedia — “Selected anniversaries/October 20” — the anniversaries editors chose for the date and the article each one is about (checked 2026-10-15)
• Wikidata — in how many language editions each entry's own article exists, used to fill the lists (CC0) (checked 2026-10-15)
• vacanza/holidays (open-source holiday rules, MIT licence) — holiday rules used to build the lists (checked 2026-10-15)

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 2026-10-15 through the Wikimedia “On this day” feed. They are licensed under CC BY-SA 4.0; this selection is shared under the same licence. Every anniversary that Wikipedia's editors selected for October 20 stays on the list; the remaining places, up to 26 events, 22 births and 14 deaths, go to the entries whose own article — about the event itself, or else the person or thing it is about — appears in the most language editions (counted from Wikidata); an article about a person or thing, which covers far more than one day, counts half. An entry with no article of its own counts, also at half, by the least covered article it links, and one that links only places counts for nothing. Each list runs by year, and the wording is unchanged apart from removing references to pictures, audio and video.