In the "Protagoras" of Plato, (dramatic date c. 430 BC), Prodicus is mentioned as having previously arrived in Athens. He appears in a play of Eupolis, and in "The Clouds" (423 BC) and "The Birds" (414 BC) of Aristophanes. He came frequently to Athens on public business. His pupils included the orators Theramenes and Isocrates, and in the year of the death of Socrates (399 BC), Prodicus was still living. According to the statement of Philostratus, on which little reliance can be placed, he delivered his lecture on virtue and vice in Thebes and Sparta also. The "Apology" of Plato unites him with Gorgias and Hippias as among those who were considered competent to instruct the youth in any city. Lucian mentions him among those who held lectures at Olympia.