Free will in antiquity
In Plato's Gorgias (and in the Protagoras 345c4-e6), Socrates argues that no one does wrong willingly, one of the most famous doctrines to be associated with him. When framed in modern (Western) terms, the implication is that it is ignorance, rather that free individual agency, that is responsible for morally wrong actions.
Socratic problem
Socrates — who is often credited with turning Western philosophy in a more ethical/political direction and who was put to death by the democracy of Athens in May 399 BC — was Plato's mentor. Plato, like some of his contemporaries, wrote dialogues about his teacher. Much of what is known about Socrates comes from Plato's writings; however, it is widely believed that very few, if any, of Plato's dialogues can be verbatim accounts of conversations between them or unmediated representations of Socrates' thought. Many of the dialogues seem to use Socrates as a device for Plato's thought, and inconsistencies occasionally crop up between Plato and the other accounts of Socrates; for instance, Plato has Socrates denying that he would ever accept money for teaching, while Xenophon's "Symposium" clearly has Socrates stating that he is paid by students to teach wisdom and that this is what he does for a living.