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Herakles and Iolaos (right) fight the Hydra on an amphora dated about 530 BC

In Greek mythology, Iolaus (Greek: Ἰόλαος, Iólaos) was the nephew of Herakles, son of the hero's twin brother Iphicles and Automedusa. He was famed for having assisted Herakles in completing his Labors, serving as the hero's charioteer. A genus of Lycaenid butterfly has been named after him.