Iolāus
(
Ἰόλαος). Son of Iphicles, the halfbrother of Heracles,
and the faithful companion and charioteer of that hero. For his help in destroying the
Lernaean hydra and in the fight with Cycnus, Heracles transferred to him his first wife
Megara. The friendship he had devoted to the father he continued to the
children of Heracles in defending them against Eurystheus. As the comrade of Heracles he was
worshipped beside him in Thebes, where the gymnasium was named after him, and where the
inhabitants used to swear by his name.