Hipparchus hĭpär´kəs [key], c.555–514 BC, Athenian political figure, son of Pisistratus . After the death of his father, he was closely associated with his brother Hippias, tyrant of Athens, in ruling the Athenian city-state. Under Hippias he was a patron of the arts and sponsored the poets Anacreon and Simonides. He was slain by Harmodius and Aristogiton because of his personal vices.

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