Ptolemy, son of Philip was an officer who commanded the leading squadron of Macedonian cavalry (that of Socrates) at the Battle of the Granicus. Both Gronovius and Droysen, 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.

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Ptolemy, son of Philip was an officer who commanded the leading squadron of Macedonian cavalry (that of Socrates) at the Battle of the Granicus. Both Gronovius and Droysen, 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. Notes References Who's Who in the Age of Alexander the Great by Waldemar Heckel Generals of Alexander the Great

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“I know that I am mortal by nature and ephemeral, but when I trace at my pleasure the windings to and fro of the heavenly bodies, I no longer touch earth with my feet. I stand in the presence of Zeus himself and take my fill of ambrosia.”
— In some of the manuscripts, the books begins with this epigram (Owen Gingerich, The Eye of Heaven: Ptolemy, Copernicus, Kepler, American Institute of Physics, 1993, p. 55).
“We consider it a good principle to explain the phenomena by the simplest hypothesis possible.”
— Book III, sec 1 (trans. Gerald J. Toomer)
“πᾶν μὲν τὸ δυσέφικτον παρὰ τοῖς πολλοῖς εὐδιάβλητον ἔχει φύσιν”
— Everything that is hard to attain is easily assailed by the generality of men.
“The length of lifetakes the leading place among inquiries about events following birth.”
— Book III, sec. 10
“As material fortune is associated with the properties of the body, so honor belongs to those of the soul.”
— Book IV, sec. 1
“There are three classes of friendship and enmity, since men are so disposed to one another either by preference or by need or through pleasure and pain.”
— Book IV, sec. 7