More on Protagoras of Abdera from Infoplease:

• Protagoras of Abdera - Protagoras of Abdera was the first who took the name of “Sophist.” (B.C. 480-411.) ...
• Sophist, Sophistry, Sophism, Sophisticator - Sophist, Sophistry, Sophism, Sophisticator etc. These words have quite run from their legitimate ...
• Dictionary of Phrase and Fable: P - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "P"