An Athenian of high birth, and related to Pericles, possessed of a handsome person, brilliant abilities, and great wealth, but was of a wayward temper and depraved, whom Socrates tried hard to win over to virtue, but failed. He involved his country in a rash expedition against Sicily, served and betrayed it by turns in the Peloponnesian war, and died by assassination in exile (450-404 B.C.).