Callippus (/kəˈlɪp.əs/; Ancient Greek: Κάλλιππος Συρακούσιος) was a tyrant of Syracuse, Magna Graecia, who ruled briefly for thirteen months[1] from 354 to 352 BC. He was a native Athenian, who traveled with Dion to Sicily to capture Syracuse, where Dion became the tyrant. Callippus then gained power by assassinating Dion, but ruled briefly before being ousted from power himself. Afterwards he commanded a band of mercenaries, who later killed him with the same sword that he used to kill Dion.