The first Sophist. 


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 (c.480 - 411 B.C.E.)


Protagoras, sophist and presocratic philosopher.  


(Public Domain image and caption from Wikimedia Commons)


Contribution to Rhetoric 


 Considered the first Sophist, Protagoras is most well known for his statement, "Man is the measure of all things."  He was one of the earliest to express a relativistic world view, and by some accounts he was persecuted for his beliefs.  Most of what is known about Protagoras comes from the writings of Plato, especially "Protagoras."