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This article about Iolaus is a stub. You can help Mythology Wiki by expanding it.
Iolaus was the son of Iphicles and Automedusa. He was the grandson of Alcmene and Amphitryon. He accompanied his uncle Heracles (son of Alcmene and Zeus) during his twelve labours. He notably helped defeat the Lernaean Hydra (which sprouted two heads for every one it lost) by cauterising the wounds, leaving it unable to regenerate.