He Who Labours

Heracles had an extremely violent temperament as an infant, and grew up as a shepherd in order to obtain a gentle heart. Having grown into a fine adult, Heracles was recognized for several feats, and gained two children as well as the right of succession to the throne. However, Hera made Heracles go temporarily insane and he killed his wife and children, ending up in the role of a slave to the king to atone for his sins. Here the jealous king gave him a challenge, the famous Twelve Labors. The Labors were all things that a human could not achieve but Heracles completed them safely, and at the same time he was freed from slavery, he received an immortal body.

-Fate/complete material III