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.
History of ethics
In his personal life, Socrates lived extremely morally. He was chaste, disciplined, pious, responsible, and cared for his friends In Gorgias he defends the notion that it is better to suffer injustice than to do it. The Greeks found this paradoxical, but Socrates both argued and lived this philosophy consistently. That is because the doing of evil damages the soul, which is the highest part of humans. In the Republic, Socrates is challenged to defend the view that we have reasons to be moral that do not come from rational self-interest, in response to Glaucon's arguments in Book 2. The Republic develops the view that being a good person in an ethical sense involves achieving internal harmony of the parts of the soul. However, Plato's ethical ideal, as expressed in the Republic, still has much in common with the Homeric conception of the leader of a tribe or city: the successful running of the city and the internal harmony of the citizen who runs it is the main ethical aim, and there is little mention in Plato of any strictly moral obligations the ruler may be under.