There are Simmias and Cebes (Crito), two disciples of Philolaus whom Socrates 'by his enchantments has attracted from Thebes' (Mem.), Crito the aged friend, the attendant of the prison, who is as good as a friend--these take part in the conversation. There are present also, Hermogenes, from whom Xenophon derived his information about the trial of Socrates (Mem.), the 'madman' Apollodorus (Symp.), Euclid and Terpsion from Megara (compare Theaet.), Ctesippus, Antisthenes, Menexenus, and some other less-known members of the Socratic circle, all of whom are silent auditors. Aristippus, Cleombrotus, and Plato are noted as absent. Almost as soon as the friends of Socrates enter the prison Xanthippe and her children are sent home in the care of one of Crito's servants. Socrates himself has just been released from chains, and is led by this circumstance to make the natural remark that 'pleasure follows pain.' (Observe that Plato is preparing the way for his doctrine of the alternation of opposites.) 'Aesop would have represented them in a fable as a two-headed creature of the gods.' The mention of Aesop reminds Cebes of a question which had been asked by Evenus the poet (compare Apol.): 'Why Socrates, who was not a poet, while in prison had been putting Aesop into verse?'--'Because several times in his life he had been warned in dreams that he should practise music; and as he was about to die and was not certain of what was meant, he wished to fulfil the admonition in the letter as well as in the spirit, by writing verses as well as by cultivating philosophy