The twelve labors

In the seventh labor, the task of Herakles was to bring alive in Mykenae the mad bull who was ravaging the island of Crete. This bull had been sent by Poseidon from the sea to king Minos, in order to sacrifice him. King Minos charmed by his beauty kept the animal and sacrificed another one in his place. Poseidon, in order to punish Minos for his disobedience, drove the bull mad.
Herakles caught the bull, but when he came back to Peloponnese, he set him free.
Later the bull was killed by Theseus, at Marathon.