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.
Thirty Tyrants
In Plato's "Apology", Socrates recounts an incident in which the Thirty once ordered him (and four other men) to bring before them Leon of Salamis, a man known for his justice and upright character, for execution. While the other four men obeyed, Socrates refused, not wanting to partake in the guilt of the executioners. However, he did not attempt to warn or save Leon of Salamis. By disobeying, Socrates may have been placing his own life in jeopardy, and he claimed it was only the disbanding of the oligarchy soon afterward that saved his life: