In the Protagoras (324d) a distinction is made between muthos and logos, where muthos appears to refer to a story and logos to an argument. This distinction seems to be echoed in the Theaetetus and the Sophist. In the Theaetetus Socrates discusses Protagoras’ main doctrine and refers to it as “the muthos of Protagoras” (164d9) (in the same line Socrates also calls Theaetetus’ defence of the identity of knowledge and perception a muthos). And later on, at 156c4, Socrates calls a muthos the teachi