Heracles, or as he is more often portayed in contemporary media, Hercules, was a Greek demigod, son of Zeus. Because he was a demigod, he had incredible strength (which he used to perform his twelve labors). He was married to Megara, the daughter of the king of Thebes. They had anywhere between three and eight children, but in a fit of madness sent by Hera (who often didn't like the children of Zeus as they were living proof of his infidelity to her, the Goddess of marriage) Heracles Killed Megara and their children. When he regained his sanity, he consulted the oracle at Delphi searching for a way of atoning for his sins, and was told he was to become a servant of the king Eurystheus. It was he who assigned the famous twelve labors upon Heracles. These tasks were as follows:
See also Who were the Gods