Protagoras (dialogue)
Platonic dialogue

Protagoras ( proh-TAG-ər-əs, -ass; Ancient Greek: Πρωταγόρας) is a dialogue by Plato. The traditional subtitle (which may or may not be Plato's) is "or the Sophists". The main argument is between Socrates and the elderly Protagoras, a celebrated sophist and philosopher. The discussion takes place at the home of Callias, who is host to Protagoras while he is in town. The philosophical issues raised in the Protagoras include the unity and the teachability of virtue, and the relationship between pleasure and goodness.
The characters
Of the twenty-one people who are specifically said to be present, three are known sophists. In addition to Protagoras himself, there are Hippias of Elis and Prodicus of Ceos. Two of the sons of Pericles are said to be there, Paralus and Xanthippus. With the exception of Aristophanes, all of Socrates' named friends from the Symposium are in attendance: Eryximachus the doctor, Phaedrus, the lovers Pausanias and Agathon (who is said to be a mere boy at this point), and Alcibiades. Additionally, there are several unnamed foreigners whom Protagoras is said to have picked up in his travels and a servant (a eunuch) in the employ of Callias.
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