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|Full name||Protagoras (Πρωταγόρας)|
|Main interests||language, semantics, relativism|
|Notable ideas||The "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.