  The dialogue’s narrator is Cephalus, who has just arrived in Athens after a trip from his home in Clazomenae. Cephalus runs into Plato’s half brothers, Adeimantus and Glaucon, and asks them to confirm the existence of someone who has completely memorized a conversation that Parmenides and Zeno once had with Socrates. Adeimantus confirms that his half brother, Antiphon, can recite the conversation in toto, having heard it from a friend of Zeno’s, Pythodorus, in whose house the conversation took place. Cephalus, Adeimantus, and Glaucon then pay a visit to Antiphon, who, after a bit of prodding, agrees to replay the conversation. As most scholars agree, the conversation putatively recorded by Pythodorus, passed on to Antiphon, and then recounted to Cephalus, is almost certainly fictitious. This hypothesis partly explains why Plato chose to frame the dialogue at third remove.