Gorgias

Gorgias /ˈɡɔrdʒiəs/ (Greek: Γοργίας, ; "the Nihilist"; c. 485 – c. 380 BC), Greek sophist, pre-socratic philosopher and rhetorician, was a native of Leontini in Sicily. Along with Protagoras, he forms the first generation of Sophists. Several doxographers report that he was a pupil of Empedocles, although he would only have been a few years younger. "Like other Sophists he was an itinerant, practicing in various cities and giving public exhibitions of his skill at the great pan-Hellenic centers of Olympia and Delphi, and charged fees for his instruction and performances. A special feature of his displays was to invite miscellaneous questions from the audience and give impromptu replies."

His chief claim to recognition resides in the fact that he transplanted rhetoric from his native Sicily to Attica, and contributed to the diffusion of the Attic dialect as the language of literary prose.

Read more about Gorgias:  Life, Rhetorical Innovation, On The Non-Existent, Critics