September 12 is the 255th day of the year (256th in leap years) in the Gregorian calendar. There are 110 days remaining until the end of the year.
Events：
490 BC – Battle of Marathon: The conventionally accepted date for the Battle of Marathon. The Athenians and their Plataean allies, defeat the first Persian invasion force of Greece.
372 – Sixteen Kingdoms: Jin Xiaowudi, age 10, succeeds his father Jin Jianwendi as Emperor of the Eastern Jin dynasty.
1185 – Emperor Andronikos I Komnenos brutally put to death in Constantinople.
1213 – Albigensian Crusade: Simon de Montfort, 5th Earl of Leicester, defeats Peter II of Aragon at the Battle of Muret.
1229 – Battle of Portopí: The Aragonese army under the command of James I of Aragon disembarks at Santa Ponça,Majorca, with the purpose of conquering the island.
1309 – The First Siege of Gibraltar takes place in the context of the Spanish Reconquista pitting the forces of the Kingdom of Castile against the Emirate of Granada resulting in a Castilian victory.
1609 – Henry Hudson begins his exploration of the Hudson River while aboard the Halve Maen.
1683 – Austro-Ottoman War: Battle of Vienna – several European armies join forces to defeat the Ottoman Empire.
1814 – Battle of North Point: an American detachment halts the British land advance to Baltimore in the War of 1812.
1846 – Elizabeth Barrett elopes with Robert Browning.
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