Protagoras (ca. 490- 420 BC) was a pre-Socratic Greek philosopher and is numbered as one of the sophists by Plato. In his dialogue Protagoras, Plato credits him with having invented the role of the professional sophist or teacher of virtue
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"Protagoras Quotes." Quotes.net. STANDS4 LLC, 2014. Web. 19 Sep. 2014. <http://www.quotes.net/authors/Protagoras>.