| September 23rd 0951 | | Otto I the Great becomes king of Italy
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| September 23rd 1122 | | Concord of Worms
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| September 23rd 1408 | | Battle of Oth‚e
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| September 23rd 1513 | | King Henry III & Emperor Maximilian conquer Doornik
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| September 23rd 1561 | | King Philip II of Spain forbids Spanish settlements in Florida
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| September 23rd 1642 | | Harvard College in Cambridge, Mass, 1st commencement
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| September 23rd 1666 | | Princess Maria of Orange-Nassau marries Mauritius earl of Simmeren
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| September 23rd 1719 | | Liechtenstein declares independence from German empire
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| September 23rd 1739 | | Russia & Turkey sign Peace of Belgrade
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| September 23rd 1746 | | Jacob Gilles appointed Dutch pension advisor
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| September 23rd 1779 | | John Paul Jones' "Bon Homme Richard" defeats HMS Serepis
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| September 23rd 1780 | | Brit Maj John Andr‚ reveals Benedict Arnold's plot to betray West Pt
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| September 23rd 1795 | | Conseil of the Cinq-Cents (Council of 500), forms in Paris
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| September 23rd 1803 | | Battle of Assaye-British-Indian forces beat Maratha Army
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| September 23rd 1806 | | Lewis & Clark return to St Louis from Pacific Northwest
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