c. 320 BCE[1]) of Olynthus was a philosopher of the Megarian school as well as a historian and tragic poet.
He was the disciple of Eubulides of Miletus, and the instructor of Antigonus II Gonatas king of Macedonia.
He also wrote a very highly esteemed work, On Kingship (Greek: Περὶ Βασιλείας), addressed to Antigonus, and a history of his own times.
[2][3] Athenaeus[4] refers to Euphantus relating a detail about Ptolemy III Euergetes of Egypt, who reigned much later.
The discrepancy has been explained variously, by supposing the existence of an Egyptian Euphantus,[5] or by amending "III" to "I".