Euphantus, who lived to a great age, wrote an esteemed work "On Kingship" addressed to Antigonus and a history of his own times  in which he references Ptolemy III (who reigned much later) but the discrepancy has been explained by the discovery of the correct dates Euphantus lived.
Euphantus (Greek: ; fl. c. 320 BC) of Olynthus was a philosopher of the Megarian school as well as an historian and tragic poet. He lived to a great age. He also wrote a very highly esteemed work, On Kingship (Greek:  ), addressed to Antigonus, and a history of his own times. Athenaeus 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, or by amending "III" to "I". 
