In 480 BC Leonidas, King of Sparta, frustrated the advance of Xerxes the Persian just long enough to change the course of the war — and history.
In 480 BC, the Persian King Xerxes (r. 486-465 BC) led a campaign to punish the sovereign city-states of Greece for their refusal to join his vast and dictatorial empire. An enormous Persian army recruited from all over Asia reached the eastern mainland late in August, only to find four thousand preening Greeks barring the way.
The Persian King felt that a lord of his majesty should not have to take any nonsense from an overgrown river.
In 483 BC, Xerxes I (r. 486-465 BC) rallied all Persia for a second attempted conquest of Greece, after the failure of Darius I at Marathon seven years earlier. He planned his route meticulously, throwing two bridges across the Hellespont, the narrow stretch of water between the mainland of Asia Minor and the Gallipoli peninsula in what is now Turkey, but it was not a straightforward business.