The Messenians, who had never forgotten Aristodemus, hoped to free themselves again.  A great many of the Helots joined them, and they made their fortified hill of Ithome very strong.  The Spartans called on the Athenians to help them to put down the insurrection.  The three greatest men in Athens were Pericles, the son of that Xanthippus who had impeached Miltiades; Kimôn, the son of Miltiades himself; and Ephialtes, a great orator, who was thought to be as upright as Aristides the Just.  When the request from Sparta came, Ephialtes was against helping the rival of Athens; but Kimôn, who had friends in Laconia, declared that it would be unbecoming in Athens to let Greece be crippled in one of her two legs, or to lose her own yoke-fellow.  He prevailed, and was sent with an army to help in the siege of Ithome; but it was such a tardy siege that the Spartans fancied that the Athenians had an understanding with the Messenians, and desired them to go home again, thus, of course, affronting them exceedingly.