Labor Seven: the Cretan Bull

Queen Pasiphae of Crete had been inspired by a vengeful god to fall in love with a bull, with the result that the Minotaur was born -- a monster half-man and half-bull that haunted the Labyrinth of King Minos. Pasiphae's husband was understandably eager to be rid of the bull, which was also ravaging the Cretan countryside, so Hercules was assigned the task as his seventh Labor. Although the beast belched flames, the hero overpowered it and shipped it back to the mainland. It ended up near Athens, where it became the duty of another hero, Theseus, to deal with it once more.