 From a philosophical perspective of special importance is the recurrent focus on the issue of correctness of names (orthotes onomaton, orthoepeia), which is to say the capacity of language to faithfully portray reality. This was the object of many discussions in fifth-century BCE Athens; Plato’s Phaedrus reports that one of Protagoras’ works was entitled Orthoepeia (The Correctness of Language; Phdr. 267c = 80A26 DK). Regrettably, the content of this book is completely unknown; but different sources confirm that Protagoras had an interest in the problem of correctness of language at different levels (Gagarin 2008: 28–30). We already mentioned Protagoras’ grammatical interests, which implied the thesis of linguistic correctness. On another level, the notion of orthos is used as a criterion for analysing poetry: correctness in this case concerns not points of grammar, but the consistency of a composition, its statements, and its moral teaching (80A25 DK). Finally, the same notion could also be applied in an even more general sense, as in the following testimony: 