DION B.c.), tyrant of Syracuse, the son of Hip parinus, and brother-in-law of Dionysius the Elder. He was a friend of Plato, who had visited the court of the elder Dionysius, and whom Dion now summoned to teach the theory of govern ment to Dionysius' son. But the historian Philistus set Dion at variance with the tyrant, and procured his banishment on a charge of intriguing with the Carthaginians. Dion remained awhile at Athens, but in 357, assembling a small force at Zacynthus, he sailed to Sicily and was received with demonstrations of joy. Dionysius, who was in Italy, returned to Sicily, but was defeated and obliged to flee. Dion himself was soon after banished through the intrigues of Heracleides (356). But the incompetence of the new leader soon led to Dion's recall; Heracleides submitted, and soon afterwards the supporters of Dionysius surrendered. Dion retained the tyranny, but in 353 he was assassinated by Callippus, an Athenian who had accompanied him in his expedition.