September 21： International Day of Peace; Independence Dayin Armenia (1991)
September 21 is the 264th day of the year (265th in leap years) in the Gregorian calendar. There are 101 days remaining until the end of the year.
Events：
455 – Emperor Avitus enters Rome with a Gallic army and consolidates his power.
1170 – Combined English and Irish forces, under the command of Richard de Clare, Earl of Pembroke and Diarmait Mac Murchada, King of Leinster seize Norse-Gaelic Dublin, forcing Ascall mac Ragnaill, King of Dublin into exile.
1217 – Livonian Crusade: The Estonian leader Lembitu and Livonian leader Kaupo the Accursed are killed inBattle of Matthew's Day.
1435 – The Congress of Arras causes Burgundy to switch sides in the Hundred Years' War.
1619 –Alingsås was granted its Royal charter by Gustavus Adolphus of Sweden which made it the oldest townVästra Götaland County.
1745 – Battle of Prestonpans: A Hanoverian army under the command of Sir John Cope is defeated, in ten minutes, by the Jacobite forces of Prince Charles Edward Stuart
1776 – Part of New York City is burned shortly after being occupied by British forces.
1780 – American Revolutionary War: Benedict Arnold gives the British the plans to West Point.
1792 – French Revolution: the National Convention declares France a republic and abolishes the absolute monarchy.
1843 – John Williams Wilson takes possession of the Strait of Magellan on behalf of the newly independent Chilean government.
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