In Greek mythology, which of these was famed for being Heracles' nephew?

In Greek mythology, Iolaus (/aɪˈoʊlaʊs/; Ancient Greek: Ἰόλαος Iólaos) was a Theban divine hero, son of Iphicles and Automedusa.

He was famed for being Heracles' nephew and for helping with some of his Labors, and also for being one of the Argonauts. Through his daughter Leipephilene, he was considered to have fathered the mythic and historic line of the kings of Corinth, ending with Telestes.

As a son of Iphicles, Iolaus was a nephew of Heracles. He often acted as Heracles' charioteer and companion. He was sometimes regarded as Heracles' lover, and the shrine to him in Thebes was a place where male couples worshipped and made vows.

Iolaus provided essential help to Heracles in his battle against the Hydra, his second labor. Seeing that Heracles was being overwhelmed by the multi-headed monster (the Lernaean Hydra), who grew two heads in place of each one cut off, Iolaus helped by cauterizing each neck as Heracles beheaded it.