Ptolemy, son of Philip (Greek: Πτολεμαῖος ὁ Φιλίππου) was an officer who commanded the leading squadron of Macedonian cavalry (that of Socrates) at the Battle of the Granicus.^[1] Both Gronovius^[2] and Droysen,^{[citation needed]} suppose that he is the same man that Alexander left with a force of 3,000 infantry and 200 cavalry to defend the province of Caria, and who subsequently, together with Asander the governor of Lydia, defeated the Persian general Orontobates, 332 BC.^[3]