Antiphon of Rhamnus (Rhamnous), c. 480 BC - 411 BC. There has been some dispute among classical scholars concerning whether the various references to an Athenian "Antiphon" in this period refer to one, two or three people. At any rate, one of them was a Sophist rhetorician and contemporary of Socrates. There was also an Antiphon, who may have been the same person, who made substantial achievements in ancient mathematics.