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Protagoras (Πρωταγόρας)
Democritus (center) and Protagoras (right) by Salvator Rosa
Full nameProtagoras (Πρωταγόρας)
EraPre-Socratic philosophy
RegionWestern Philosophy
SchoolIonian Philosophy
Main interestslanguage, semantics, relativism
Notable ideasThe "Antilogies", which consists of two premises: the first is "Before any uncertainty two opposite theses can validly be confronted", the second is its complement: the need to "strengthen the weaker argument".

Protagoras (Greek: Πρωταγόρας) (ca. 490– 420 BC) was a pre-Socratic Greek philosopher and is numbered as one of the sophists by Plato, the Greek philosopher who followed Socrates. In Plato's dialogue Protagoras, he credits Protagoras with having invented the role of the professional sophist or teacher of virtue.

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