Dion subsequently gathered an army of mercenaries and invaded his own homeland.But his success was short-lived: he was assassinated and Sicily was reduced to chaos. The effects of this influence can perhaps be seen in the mature Plato's conception of the sensible world as ceaselessly changing.
Plato's middle to later works, including his most famous work, the , are generally regarded as providing Plato's own philosophy, where the main character in effect speaks for Plato himself.Others, including Alexamenos of Teos (Aristotle passim), Simon (D. Such a claim, at any rate, is hardly established simply by the existence of these other writers and their writings.We may still wish to ask whether Plato's own use of Socrates as his main character has anything at all to do with the historical Socrates.Plato, perhaps now completely disgusted with politics, returned to his beloved Academy, where he lived out the last thirteen years of his life. His grave, however, has not yet been discovered by archeological investigations. There can be no doubt that Plato was also strongly influenced by Parmenides and Zeno (both of Elea), in Plato's theory of the Forms, which are plainly intended to satisfy the Parmenidean requirement of metaphysical unity and stability in knowable reality.
According to Diogenes, Plato was buried at the school he founded (D. Aristotle and Diogenes agree that Plato had some early association with either the philosophy of Heraclitus of Ephesus, or with one or more of that philosopher's followers (see Aristotle Metaph. Parmenides and Zeno also appear as characters in his dialogue, the He mixed together in his works the arguments of Heracleitus, the Pythagoreans, and Socrates. 3.8) A little later, Diogenes makes a series of comparisons intended to show how much Plato owed to the comic poet, Epicharmus (3.9-3.17).
Because Aristotle has no reason not to be truthful about this issue, many scholars believe that his testimony provides a solid basis for distinguishing the "Socrates" of the "early" dialogues from the character by that name in Plato's supposedly later works, whose views and arguments Aristotle suggests are Plato's own.