Eurystheus

Eurystheus was king of Tiryns, one of three Mycenaean strongholds in the Argolid, although other authors including Homer and Euripides cast him as ruler of Argos: Sthenelus was his father and the "victorious horsewoman" Nicippe his mother, and he was a grandson of the hero Perseus, as was his opponent Herakles. He was married to Antimache daughter of Amphidamas. In the contest of wills between Hera and Zeus over whose candidate would be hero, fated to defeat the remaining creatures representing an old order and bring about the reign of the Twelve Olympians, Eurystheus was Hera's candidate and Herakles was the candidate of Zeus. The arena for the actions that would bring about this deep change are the Twelve Labours imposed on Herakles by Eurystheus. The immediate necessity for the Labours of Herakles is as penance for Herakles' murder of his own family, in a fit of madness, which had been sent by Hera; however, further human rather than mythic motivation is supplied by mythographers who note that their respective families had been rivals for the throne of Mycenae. Details of the individual episodes may be found in the article on the Labours of Herakles, but Hera was connected with all of the opponents Herakles had to overcome.