On this day: August 21

Events on August 21

• 1716 Seventh Ottoman–Venetian War: Ottoman forces suddenly abandoned their siege of Corfu, allowing the Republic of Venice to preserve its rule over the Ionian Islands. Wikipedia
• 1716 Seventh Ottoman–Venetian War: The arrival of naval reinforcements and the news of the Battle of Petrovaradin force the Ottomans to abandon the Siege of Corfu, thus preserving the Ionian Islands under Venetian rule. Wikipedia
• 1717 Austro-Turkish War: Austrian troops under Prince Eugene of Savoy captured the strategically important city of Belgrade from the Ottoman Empire. Wikipedia
• 1789 The national colours of Italy first appeared on a tricolour cockade in Genoa. Wikipedia
• 1862 The Stadtpark, the first public park in Vienna, opens to the public. Wikipedia
• 1878 The American Bar Association is founded in Saratoga Springs, New York. Wikipedia
• 1879 The locals of Knock, County Mayo, Ireland report their having seen an apparition of the Virgin Mary. The apparition is later named "Our Lady of Knock" and the spot transformed into a Catholic pilgrimage site. Wikipedia
• 1901 Six hundred American school teachers, Thomasites, arrived in Manila on the USAT Thomas. Wikipedia
• 1911 Leonardo da Vinci's Mona Lisa was stolen from the Louvre by museum employee Vincenzo Peruggia and was not recovered until two years later. Wikipedia
• 1914 World War I: The Battle of Charleroi, a successful German attack across the River Sambre that pre-empted a French offensive in the same area. Wikipedia
• 1942 World War II: The Imperial Japanese Army lost the Battle of the Tenaru, the first of its three major land offensives during the Guadalcanal campaign. Wikipedia
• 1942 World War II: The Guadalcanal campaign: American forces defeat an attack by Imperial Japanese Army soldiers in the Battle of the Tenaru. Wikipedia
• 1944 Dumbarton Oaks Conference, prelude to the United Nations, begins. Wikipedia
• 1944 World War II: A combined Canadian–Polish force captured the town of Falaise, France, in the final offensive of the Battle of Normandy. Wikipedia
• 1957 The Soviet Union successfully conducts a long-range test flight of the R-7 Semyorka, the first intercontinental ballistic missile. Wikipedia
• 1959 United States President Dwight D. Eisenhower signs an executive order proclaiming Hawaii the 50th state of the union. Hawaii's admission is currently commemorated by Hawaii Admission Day. Wikipedia
• 1963 Xá Lợi Pagoda raids: The Army of the Republic of Vietnam Special Forces loyal to Ngô Đình Nhu, brother of President Ngo Dinh Diem, vandalizes Buddhist pagodas across the country, arresting thousands and leaving an estimated hundreds dead. Wikipedia
• 1968 Cold War: Nicolae Ceaușescu, leader of the Socialist Republic of Romania, publicly condemns the Soviet-led Warsaw Pact invasion of Czechoslovakia, encouraging the Romanian population to arm itself against possible Soviet reprisals. Wikipedia
• 1971 A bomb exploded in the Liberal Party campaign rally in Plaza Miranda, Manila, Philippines with several anti-Marcos political candidates injured. Wikipedia
• 1982 Lebanese Civil War: The first troops of a multinational force lands in Beirut to oversee the Palestine Liberation Organization's withdrawal from Lebanon. Wikipedia
• 1986 Carbon dioxide gas erupts from volcanic Lake Nyos in Cameroon, killing up to 1,800 people within a 20-kilometre (12 mi) range. Wikipedia
• 1991 Latvia declares renewal of its full independence after its occupation by the Soviet Union since 1940. Wikipedia
• 1991 Coup attempt against Mikhail Gorbachev collapses. Wikipedia
• 1993 NASA loses contact with the Mars Observer spacecraft. Wikipedia
• 1994 Royal Air Maroc Flight 630 crashes in Douar Izounine, Morocco, killing all 44 people on board. Wikipedia
• 2013 Hundreds of people are reported killed by chemical attacks in the Ghouta region of Syria. Wikipedia

Born on August 21

• 1165 Philip II of France (died 1223) Wikipedia
• 1567 Francis de Sales, Swiss bishop and saint (died 1622) Wikipedia
• 1765 William IV, King of the United Kingdom (died 1837) Wikipedia
• 1789 Augustin-Louis Cauchy, French mathematician and academic (died 1857) Wikipedia
• 1798 Jules Michelet, French historian and philosopher (died 1874) Wikipedia
• 1917 Leonid Hurwicz, Polish-American economist and mathematician (died 2008) Wikipedia
• 1930 Princess Margaret, Countess of Snowdon (died 2002) Wikipedia
• 1936 Wilt Chamberlain, American basketball player and coach (died 1999) Wikipedia
• 1938 Kenny Rogers, American singer-songwriter, guitarist, producer, and actor (died 2020) Wikipedia
• 1939 James Burton, American Hall of Fame guitarist Wikipedia
• 1939 Festus Mogae, Botswana economist and politician, third President of Botswana (died 2026) Wikipedia
• 1956 Kim Cattrall, English-Canadian actress Wikipedia
• 1961 Stephen Hillenburg, American marine biologist, cartoonist, animator and creator of SpongeBob SquarePants (died 2018) Wikipedia
• 1963 Mohammed VI of Morocco, King of Morocco Wikipedia
• 1967 Serj Tankian, Lebanese-born Armenian-American singer-songwriter, multi-instrumentalist, and record producer Wikipedia
• 1967 Carrie-Anne Moss, Canadian actress Wikipedia
• 1973 Sergey Brin, Russian-American computer scientist and businessman, co-founded Google Wikipedia
• 1984 Alizée, French singer Wikipedia
• 1986 Usain Bolt, Jamaican sprinter Wikipedia
• 1986 Paetongtarn Shinawatra, Thai politician and 31st Prime Minister of Thailand Wikipedia
• 1988 Robert Lewandowski, Polish footballer Wikipedia
• 1989 Hayden Panettiere, American actress (died 2026) Wikipedia

Died on August 21

• 1534 Philippe Villiers de L'Isle-Adam, 44th Grandmaster of the Knights Hospitaller (born 1464) Wikipedia
• 1568 Jean Parisot de Valette, 49th Grandmaster of the Knights Hospitaller (born 1495) Wikipedia
• 1614 Elizabeth Báthory, Hungarian countess and purported serial killer (born 1560) Wikipedia
• 1838 Adelbert von Chamisso, German botanist and poet (born 1781) Wikipedia
• 1940 Leon Trotsky, Russian theorist and politician, founded the Red Army (born 1879) Wikipedia
• 1943 Henrik Pontoppidan, Danish journalist and author, Nobel Prize laureate (born 1857) Wikipedia
• 1964 Palmiro Togliatti, Italian journalist and politician, Italian Minister of Justice (born 1893) Wikipedia
• 1979 Giuseppe Meazza, Italian footballer and manager (born 1910) Wikipedia
• 1983 Benigno Aquino Jr., Filipino journalist and politician (born 1932) Wikipedia
• 1995 Subrahmanyan Chandrasekhar, Indian-American astrophysicist and mathematician, Nobel Prize laureate (born 1910) Wikipedia
• 2005 Robert Moog, American businessman, founded Moog Music (born 1934) Wikipedia
• 2006 Bismillah Khan, Indian musician, Bharat Ratna recipient (born 1916) Wikipedia
• 2014 Albert Reynolds, Irish businessman and politician, ninth Taoiseach of Ireland (born 1932) Wikipedia
• 2018 Stefán Karl Stefánsson, Icelandic actor and singer (born 1975) Wikipedia

Holidays and observances

• Christian Feast Day: Abraham of Smolensk (Eastern Orthodox Church) Wikipedia
• Christian Feast Day: Bernard of Alzira Wikipedia
• Christian Feast Day: Cyriaca Wikipedia
• Christian Feast Day: Euprepius of Verona Wikipedia
• Christian Feast Day: Maximilian of Antioch Wikipedia
• Christian Feast Day: Our Lady of Knock Wikipedia
• Christian Feast Day: Pope Pius X Wikipedia
• Christian Feast Day: Sidonius Apollinaris Wikipedia
• Christian Feast Day: Blessed Victoire Rasoamanarivo Wikipedia
• Christian Feast Day: August 21 (Eastern Orthodox liturgics) Wikipedia
• Ninoy Aquino Day (Philippines) Wikipedia
• Youth Day (Morocco) Wikipedia
• World Senior Citizen's Day Wikipedia

The events, births, deaths and observances above are from the English Wikipedia article “August 21” 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.