Spartan king (ruled 510–487 BC). He was successful in the expulsion of the tyrant Hippias (ruled 527–510 BC) from Athens but failed to prevent the development of Athenian democracy under Cleisthenes. He decisively defeated Argos at the battle of Sepeia 494 BC. He was forced to flee from Sparta 491 BC when his bribery of Delphian priestesses was discovered and he committed suicide a year later.