Son of the
tyrant Dionysius the Elder, he was too to be tyrant of Syracusae on Sicily.
First he ruled under the supervision of the regent and philosopher Dion, who
was also his uncle.
Dion got Plato to come over in order to make his nephew a philosopher-king, which failed - resulting in Dionysius banishing Dion who in return raised an army and defeated the tyrant.
Dionysius settled in Corinth where he founded a school, and did not come back until eight years after Dions assassination. He again became tyrant of Syracusae, but was hated by his people.
The Corinthian general Timoleon captured Dionysios, and sent him into exile. Timoleon then established an oligarchy in Syracusae.