His young sons were banished by Eurystheus, and were taken by his old friend Iolaus to seek shelter in various cities, but only the Athenians were brave enough to let them remain.  Theseus had been driven away and banished from Athens; but the citizens sheltered the sons of the hero, and, when Eurystheus pursued them, a battle was fought on the isthmus of Corinth, in which the old enemy of Hercules was killed by Iolaus, with all his sons.  Then the Heraclieds (sons of Hercules) were going to fight their way back to Argos, but an army met them at the isthmus, and was going to give them battle, when Hylas proposed that he should fight with a single champion chosen on the other side.  If he gained, he was to be restored to the kingdom of Perseus; if not, there was to be a truce for a hundred years.  Hylas had not the strength of his father; he was slain, and his brothers had to retreat and bide their time.