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.
Sophist
Plato, the most famous student of Socrates, depicts Socrates as refuting some sophists in several Dialogues. These texts depict the sophists in an unflattering light, and it is unclear how accurate or fair Plato's representation of them may be; however, Protagoras and Prodicus are portrayed in a largely positive light in "Protagoras" (dialogue). Protagoras was the first sophist, whose theory said "Man is the measure of all things", meaning Man decides for himself what he is going to believe. The works of Plato and Aristotle have had much influence on the modern view of the "sophist" as a greedy instructor who uses rhetorical sleight-of-hand and ambiguities of language in order to deceive, or to support fallacious reasoning. In this view, the sophist is not concerned with truth and justice, but instead seeks power.
Some scholars, such as Ugo Zilioli argue that the sophists held a relativistic view on cognition and knowledge. However, this may involve the Greek word "doxa", which means "culturally shared belief" rather than "individual opinion". Their philosophy contains criticism of religion, law, and ethics. Though many sophists were apparently as religious as their contemporaries, some held atheistic or agnostic views (for example, Protagoras and Diagoras of Melos).