On this day: August 9

Events on August 9

• 48 BC Caesar's Civil War: Battle of Pharsalus: Julius Caesar decisively defeats Pompey at Pharsalus and Pompey flees to Egypt. Wikipedia
• 378 Gothic War: Battle of Adrianople: A large Roman army led by Emperor Valens is defeated by the Visigoths. Valens is killed along with over half of his army. Wikipedia
• 1810 Napoleon annexes Westphalia as part of the First French Empire. Wikipedia
• 1814 American Indian Wars: The Creek sign the Treaty of Fort Jackson, giving up huge parts of Alabama and Georgia. Wikipedia
• 1842 The Webster–Ashburton Treaty is signed, establishing the United States–Canada border east of the Rocky Mountains. Wikipedia
• 1862 American Civil War: Confederate troops counter-attacked and won the Battle of Cedar Mountain, after nearly being driven from the field in the early part of the battle. Wikipedia
• 1862 American Civil War: Battle of Cedar Mountain: At Cedar Mountain, Virginia, Confederate General Stonewall Jackson narrowly defeats Union forces under General John Pope. Wikipedia
• 1892 Thomas Edison receives a patent for a two-way telegraph. Wikipedia
• 1897 The first meeting of the International Congress of Mathematicians was held in Zürich, Switzerland. Wikipedia
• 1897 The first International Congress of Mathematicians is held in Zürich, Switzerland. Wikipedia
• 1942 World War II: In the first major naval engagement of the Guadalcanal campaign, Japan forced the U.S. Navy to withdraw from the Solomon Islands. Wikipedia
• 1942 World War II: Battle of Savo Island: Allied naval forces protecting their amphibious forces during the initial stages of the Battle of Guadalcanal are surprised and defeated by an Imperial Japanese Navy cruiser force. Wikipedia
• 1945 World War II: The USAAF bomber Bockscar dropped a Fat Man atomic bomb (replica pictured) on Nagasaki, Japan. Wikipedia
• 1956 About 20,000 women marched on Pretoria, South Africa, to protest the introduction of pass laws for black women under apartheid. Wikipedia
• 1969 Members of the Manson Family invaded a house and murdered American actress Sharon Tate and four guests in Los Angeles, before killing two more people the following night. Wikipedia
• 1969 Tate–LaBianca murders: Followers of Charles Manson murder pregnant actress Sharon Tate (wife of Roman Polanski), coffee heiress Abigail Folger, Polish actor Wojciech Frykowski, men's hairstylist Jay Sebring and recent high-school graduate Steven Parent. Wikipedia
• 1971 The Troubles: British forces began arresting and interning suspected Irish republican militants in Northern Ireland. Wikipedia
• 1971 The Troubles: In Northern Ireland, the British authorities launch Operation Demetrius. The operation involves the mass arrest and internment without trial of individuals suspected of being affiliated with the Irish Republican Army (PIRA). Mass riots follow, and thousands of people flee or are forced out of their homes. Wikipedia
• 1974 On the verge of an impeachment and removal from office amid the Watergate scandal, Richard Nixon became the first president of the United States to resign. Wikipedia
• 1974 As a direct result of the Watergate scandal, Richard Nixon becomes the first president of the United States to resign from office. Vice President Gerald Ford becomes president. Wikipedia
• 1995 Aviateca Flight 901 crashes into the San Vicente volcano in El Salvador, killing all 65 people on board. Wikipedia
• 1999 Russian president Boris Yeltsin fires his prime minister, Sergei Stepashin, and for the fourth time fires his entire cabinet. Wikipedia
• 2006 At least 21 suspected terrorists are arrested in the 2006 transatlantic aircraft plot that happened in the United Kingdom. The arrests are made in London, Birmingham, and High Wycombe in an overnight operation. Wikipedia
• 2007 Air Moorea Flight 1121 crashes after takeoff from Moorea Airport in French Polynesia, killing all 20 people on board. Wikipedia
• 2018 A civilian school bus in Dahyan, Yemen, was bombed by Saudi Arabia killing at least 40 children under 15. Wikipedia
• 2024 Voepass Linhas Aéreas Flight 2283 crashed near Vinhedo, São Paulo, Brazil, killing all 62 people on board. Wikipedia

Born on August 9

• 1537 Francesco Barozzi, Italian mathematician and astronomer (died 1604) Wikipedia
• 1726 Francesco Cetti, Italian priest, zoologist, and mathematician (died 1778) Wikipedia
• 1757 Elizabeth Schuyler Hamilton, American humanitarian; wife of Alexander Hamilton (died 1854) Wikipedia
• 1776 Amedeo Avogadro, Italian physicist and chemist (died 1856) Wikipedia
• 1788 Adoniram Judson, American missionary and lexicographer (died 1850) Wikipedia
• 1896 Jean Piaget, Swiss psychologist and philosopher (died 1980) Wikipedia
• 1911 William Alfred Fowler, American astronomer and astrophysicist, Nobel Laureate (died 1996) Wikipedia
• 1914 Tove Jansson, Finnish author and illustrator (died 2001) Wikipedia
• 1927 Marvin Minsky, American cognitive scientist, computer scientist, and pioneer in the field of artificial intelligence (died 2016) Wikipedia
• 1931 Mário Zagallo, Brazilian footballer and coach (died 2024) Wikipedia
• 1938 Leonid Kuchma, Ukrainian engineer and politician, 2nd President of Ukraine Wikipedia
• 1939 Romano Prodi, Italian academic and politician, 52nd Prime Minister of Italy Wikipedia
• 1953 Jean Tirole, French economist and academic, Nobel Prize laureate Wikipedia
• 1957 Melanie Griffith, American actress and producer Wikipedia
• 1961 John Key, New Zealand businessman and politician, 38th Prime Minister of New Zealand Wikipedia
• 1963 Whitney Houston, American singer-songwriter, producer, and actress (died 2012) Wikipedia
• 1968 Gillian Anderson, American-British actress, activist and writer Wikipedia
• 1968 Eric Bana, Australian actor, comedian, producer, and screenwriter Wikipedia
• 1972 Juanes, Colombian singer and songwriter Wikipedia
• 1973 Filippo Inzaghi, Italian footballer and manager Wikipedia
• 1976 Audrey Tautou, French model and actress Wikipedia
• 1985 Anna Kendrick, American actress and singer Wikipedia

Died on August 9

• 378 Valens, Roman emperor (born 328) Wikipedia
• 833 Al-Ma'mun, Iraqi caliph (born 786) Wikipedia
• 1048 Pope Damasus II Wikipedia
• 1516 Hieronymus Bosch, Early Netherlandish painter (born circa 1450) Wikipedia
• 1932 John Charles Fields, Canadian mathematician, founder of the Fields Medal (born 1863) Wikipedia
• 1942 Edith Stein, German nun and saint (born 1891) Wikipedia
• 1957 Carl Clauberg, German Nazi physician (born 1898) Wikipedia
• 1962 Hermann Hesse, German-born Swiss poet, novelist, and painter, Nobel Prize laureate (born 1877) Wikipedia
• 1963 Patrick Bouvier Kennedy, American son of John F. Kennedy (born 1963) Wikipedia
• 1969 C. F. Powell, English physicist and academic, Nobel Prize laureate (born 1903) Wikipedia
• 1975 Dmitri Shostakovich, Russian pianist and composer (born 1906) Wikipedia
• 1996 Frank Whittle, English soldier and engineer, invented the jet engine (born 1907) Wikipedia
• 2000 John Harsanyi, Hungarian-American economist and academic, Nobel Prize laureate (born 1920) Wikipedia
• 2008 Mahmoud Darwish, Palestinian author and poet (born 1941) Wikipedia

Holidays and observances

• Battle of Gangut Day (Russia) Wikipedia
• Christian feast day: Candida Maria of Jesus Wikipedia
• Christian feast day: Edith Stein (St Teresa Benedicta of the Cross) Wikipedia
• Christian feast day: Firmus and Rusticus Wikipedia
• Christian feast day: Blessed Florentino Asensio Barroso Wikipedia
• Christian feast day: Herman of Alaska (Russian Orthodox Church and related congregations; Episcopal Church (USA)) Wikipedia
• Christian feast day: Mary Sumner (Church of England) Wikipedia
• Christian feast day: Nath Í of Achonry Wikipedia
• Christian feast day: Romanus Ostiarius Wikipedia
• Christian feast day: Secundian, Marcellian and Verian Wikipedia
• Christian feast day: August 9 (Eastern Orthodox liturgics) Wikipedia
• International Day of the World's Indigenous Peoples (United Nations) Wikipedia
• Meyboom (Brussels and Leuven, Belgium) Wikipedia
• National Day, celebrates the independence of Singapore from Malaysia in 1965. Wikipedia
• National Peacekeepers' Day, celebrated on Sunday closest to the day (Canada) Wikipedia
• National Women's Day (South Africa) Wikipedia
• Day of the Finnish art, also birthday of Tove Jansson (Finland) Wikipedia

The events, births, deaths and observances above are from the English Wikipedia article “August 9” 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.