Protagoras of Abdera
Protagoras of Abdera
(about 480-410 B.C.) A leading Sophist, renowned for his philosophical wisdom; author of many treatises on grammar, logic, ethics and politics; visited Athens on numerous occasions and was finally forced to flee after having been convicted of impiety. His famous formula that man is the measure of all things is indicative of his relativism which ultimately rests upon his theory of perception according to which we know only what we perceive but not the thing perceived. — M.F.