522 BC: Darius I of Persia kills Magian usurper Gaumâta, securing his hold as king of the Persian Empire

480 BC: Battle of Salamis: The Greek fleet under Themistocles defeats the Persian fleet under Xerxes I

1567: War of Religion breaks out in France – Huguenots try to kidnap King Charles IX

1829: The first units of the London Metropolitan Police appear on the streets of the British capital

2008: Dow Jones Industrial Average falls 777.68 points, its largest single-day point loss, following the bankruptcies of Lehman Brothers and Washington Mutual.

Source: Onthisday.com