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.
Socrates
Perhaps the most interesting facet of this is Socrates's reliance on what the Greeks called his "daimōnic sign", an averting (ἀποτρεπτικός "apotreptikos") inner voice Socrates heard only when he was about to make a mistake. It was this "sign" that prevented Socrates from entering into politics. In the "Phaedrus", we are told Socrates considered this to be a form of "divine madness", the sort of insanity that is a gift from the gods and gives us poetry, mysticism, love, and even philosophy itself. Alternately, the "sign" is often taken to be what we would call "intuition"; however, Socrates's characterization of the phenomenon as "daimōnic" may suggest that its origin is divine, mysterious, and independent of his own thoughts. Today, such a voice would be classified under the "Diagnostic and Statistical Manual of Mental Disorders" as a command hallucination.