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| Birthday  August 21, 1165   Philip II Augustus, 1st great Capetian king of France (1179-1223) | 
| Birthday  August 21, 1660   Hubert Gautier, engineer, wrote 1st book on bridge building | 
| Birthday  August 21, 1754   Bloody Ban Tarleton born in Britain | 
| Birthday  August 21, 1765   William IV, king of England (1830-37) | 
| Birthday  August 21, 1872   Aubrey Beardsley, English artist (or 0824) | 
| Birthday  August 21, 1906   Count Basie, musician | 
| Birthday  August 21, 1930   Princess Margaret, of England | 
| Birthday  August 21, 1936   Wilt Chamberlain, NBA great | 
| Birthday  August 21, 1936   Mart Crowley, playwright | 
| Birthday  August 21, 1938   Kenny Rogers, singer | 
| Birthday  August 21, 1939   Clarence Williams III, (Mod Squad) | 
| Birthday  August 21, 1944   Jackie DeShannon, in Kentucky | 
| Birthday  August 21, 1945   Patty McCormack, Actress | 
| Birthday  August 21, 1959   Jim McMahon, Chicago Bears QB | 
| Birthday  August 21, 1962   Matthew Broderick, Actor (Ferris Buehler) | 
| History  August 21, 1560   Tycho Brahe becomes interested in astronomy | 
| History  August 21, 1680   Pueblo Indians took possession of Santa Fe | 
| History  August 21, 1831   Former slave Nat Turner led a violent insurrection against slavery | 
| History  August 21, 1831   Slave revolt erupts in Virginia | 
| History  August 21, 1841   John Hampson patents the venetian blind | 
| History  August 21, 1858   1st Lincoln-Douglas debate in Illinois | 
| History  August 21, 1858   Lincoln-Douglas debates begin | 
| History  August 21, 1863   Outlaws attack Lawrence, Kansas | 
| History  August 21, 1863   Guerillas massacre residents of Lawrence, Kansas | 
| History  August 21, 1878   American Bar Association organized at Sarasota N.Y | 
| History  August 21, 1883   Trial of Frank James begins in Missouri | 
| History  August 21, 1897   Olds Motor Works founded | 
| History  August 21, 1911   Theft of Mona Lisa is discovered | 
| History  August 21, 1914   Battles of the Frontiers fought near Ardennes and Charleroi | 
| History  August 21, 1920   Christopher Robin's birthday | 
| History  August 21, 1933   Ruth homer leads the AL to a 4-2 win in the 1st All Star Game | 
| History  August 21, 1935   The Swing Era begins with Benny Goodman's triumphant Palomar Ballroom performance | 
| History  August 21, 1940   Leon Trotsky died of wounds inflicted by an assailant the day before | 
| History  August 21, 1944   The seeds of the United Nations are planted | 
| History  August 21, 1945   Pres Truman ended the Lend-Lease program | 
| History  August 21, 1959   Eisenhower signs Hawaii statehood bill | 
| History  August 21, 1959   Hawaii becomes 50th US state | 
| History  August 21, 1961   Kenyatta freed | 
| History  August 21, 1963   Martial law declared in S Vietnam | 
| History  August 21, 1963   Nhu's Special Forces attack the Buddhists | 
| History  August 21, 1965   Gemini 5 launched into earth orbit (2 astronauts) | 
| History  August 21, 1965   U.S. pilots given green light to go after anti-aircraft missiles in the North | 
| History  August 21, 1968   William Dana reaches 80 km (last high-altitude X-15 flight) | 
| History  August 21, 1969   Nixon meets with South Korean President | 
| History  August 21, 1971   Antiwar protestors raid draft offices | 
| History  August 21, 1972   US orbiting astronomy observatory Copernicus is launched | 
| History  August 21, 1982   Palestinian terrorists are dispersed from Beirut | 
| History  August 21, 1983   Opposition leader Begnigno S. Aquino Jr. assassinated in Manila | 
| History  August 21, 1986   Gas cloud kills Cameroon villagers | 
| History  August 21, 1986   Volcanic eruption in Cameroon releases poison gas killing 2000 | 
| History  August 21, 1987   Dirty Dancing opens | 
| History  August 21, 1991   Coup attempt against Gorbachev collapses | 
| History  August 21, 2004   Michael Phelps wins eighth medal | 
| History  August 21, 2017   Next total solar eclipse visible from North America |