Events on 21 September 42
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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.
Year 1217
Livonian Crusade: The Estonian leader Lembitu and Livonian leader Kaupo the Accursed are killed in Battle of Matthew's Day.
Year 1435
The Congress of Arras causes Burgundy to switch sides in the Hundred Years' War.
Year 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
Year 1780
American Revolutionary War: Benedict Arnold gives the British the plans to West Point.
Year 1792
French Revolution: The National Convention declares France a republic and abolishes the absolute monarchy.
Year 1843
John Williams Wilson takes possession of the Strait of Magellan on behalf of the newly independent Chilean government.
Year 1860
Second Opium War: An Anglo-French force defeats Chinese troops at the Battle of Palikao.
Public Holidays Around The World On This Day 6
Birthdays on 21 September 238
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Deaths on 21 September 91
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