"a labour of Hercules"
Mosaic of Hercules capturing the Cretan Bull, from National Archaeological Museum of Spain, Madrid
Creative Commons Attribution Share AlikeMosaic of Hercules capturing the Cretan Bull, from National Archaeological Museum of Spain, Madrid - Credit: Luis García

Hercules was the illegitimate son of Jupiter, king of the Roman Gods, and a mortal.  Juno, wife of Jupiter, hated Hercules and sent him mad. During his madness, he slew his children.  As a penance, Hercules performed twelve seemingly-impossible labours, testing his strength, bravery, endurance, skill and cunning.