One of the leading philosophers of the fifth century BCE, Anaxagoras continued the cosmological style of philosophy begun in Miletus in the preceding century. Born in Clazomenae in Asia Minor around 500, he came to Athens and spent thirty years there, enjoying access to intellectual circles through his friendship with Pericles. Two alternate accounts of his dates in Athens are available: either he came around 480 and stayed until 450, or he came around 460 and stayed until 430. Because his name is associated with a meteor that fell near Aegospotami around 467, and his theory of the Nile floods was known to Aeschylus (d. 456), it appears that his work was well known already in the 460s, supporting an early date at least for his philosophical activity. Anaxagoras is said to have fled Athens to avoid prosecution on a charge of impiety, and he...