(Νυσαῖος), son of the elder Dionysius, tyrant of Syracuse, by his wife Aristomache, the daughter of Hipparinus. (Diod. 16.6.) We know nothing of the steps by which he rose to the supreme power at Syracuse; but it seems probable that he succeeded his brother Hipparinus in the sovereignty, which he held until B. C. 346, when he was expelled by his half-brother, the younger Dionysius. (Plut. Tim. 1.) He was chiefly remarkable for his love of drinking and his immoderate addiction to gross sensual indulgences. (Theopomp. apud Alten. x. pp. 435, 436; Aelian, Ael. VH 2.41.)