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 popularly regarded as Heracles' lover, and the shrine to him in Thebes was a place where male couples worshiped and made vows.
The Theban "gymnasium was also named after him, and the Iolaia or Iolaea ("Greek: Ιολάεια), an athletic festival consisting of gymnastic and equestrian events, was held yearly in Thebes in his honor. The victors at the Iolaea were crowned with garlands of "myrtle.
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 sprang to help, "cauterizing each neck as Heracles beheaded it.
Heracles gave his wife, "Megara, age thirty three, to Iolaus, then only sixteen years old – ostensibly because the sight of her reminded him of his murder of their three children. They had a daughter, "Leipephilene. He was one of the "Heraclidae.
Upon Heracles' death, Iolaus lit the funeral pyre.["citation needed] However, according to some mythographers,["according to whom?] this was "Philoctetes instead. In Sophocles' Philoctetes, Philoctetes was given Herakles' bow and arrow as reward for lighting the funeral pyre. In other versions, it is Poeas.["citation needed]
According to "Diodorus Siculus, Iolaus was sent by "Heracles to "Sardinia, together with nine of the sons that he had with the fifty daughters of "Thespius (the Thespiades), to colonize the island, giving rise to the people of Iolaensi.
Iolaus and the Thespians were buried in Sardinia.
"Aristotle said that Sardinia had practiced the rite of "incubation, which is the liberation ritual of the people who were affected by "nightmares and "obsessions. These rituals included that the persons suffering from nightmares should sleep next to the tombs of heroes.
"Simplicius of Cilicia adds, in the eight books of the Commentaries "Aristotle, that "the places where they were deposited and preserved corpses of the nine heroes that Heracles got from the Thespians and who came to Sardinia with the colony of Iolaus, became the famous oracles."