But the most remarkable philosophic trend in the late Hellenistic period was first and foremost inspired by Plato's philosophy. We therefore call it Neoplatonism.
Although it's greatly oversimplified, we could say that Neoplatonism was handed down in the west, Plato in the east, and Aristotle to the Arabs in the south.
Neoplatonism As I showed you, Cynicism, Stoicism, and Epicureanism all had their roots in the teaching of Socrates. They also made use of certain of the pre-Socratics like Heraclitus and Democritus.