A History of Western Philosophy: And Its Connection with Political and Social Circumstances from the Earliest Times to the Present Day

by Bertrand Russell

CHAPTER X Protagoras THE great pre-Socratic systems that we have been considering were confronted, in the latter half of the fifth century, by a sceptical movement, in which the most important figure was Protagoras, chief of the Sophists. The word “Sophist” had originally no bad connotation; it meant, as nearly as may be, what we mean by “professor.”