  As Antiphon tells the story, the noted Eleatic philosophers, Parmenides (then around 65 years old) and Zeno (then around 40 years old), have come to Athens for the Great Panathenaea. Having heard of their arrival, a youthful Socrates (then around 20 years old) and some friends of his have come to Pythodorus’s house to listen to Zeno read from his book. At the end of Zeno’s performance, Pythodorus, Parmenides, and Aristotle, who have been waiting outside the house, return and witness an exchange between Zeno and Socrates.