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Artemisium(är'təmĭsh`ēəm), cape, N Euboea (now Évvoia), Greece, named for a great temple of Artemis. Off the cape in 480 B.C. was fought a naval battle of the Persian Wars. The delay won by the defense of Thermopylae under LeonidasLeonidas
, d. 480 B.C., king of Sparta. He succeeded (c.491 B.C.) his half-brother, Cleomenes I. When the Persians invaded Greece under Xerxes (480 B.C.), Leonidas with 300 Spartans and 5,000 auxiliaries was given the pass at Thermopylae to hold. There was treachery.
..... Click the link for more information. helped make it possible for the Greeks to ward off the Persian fleet, although the fighting was indecisive and the Greeks were eventually forced to withdraw.