The twelve labors

In the tenth labor, Herakles was ordered to bring the red cattle of Geryon's, a giant with three human bodies joined at the waist, living in the island of Erytheia, near the Ocean stream in the West (according to others the island of Gades or the Baleario islands).
The red cattle were watched by the shepherd Eurytheion and his dog Orthos, with two heads and a serpent's tail, the son of Typhon and Echidna.
After many adventures, Herakles arrived at the frontiers of Africa and Europe, where he erected two pillars, Calpe in Libya and Abyla in Europe (the well known Pillars of Hercules).
Annoyed there by the heat, Herakles shot an arrow on the Sun, who in return gave him a golden cup or a boat as present, admiring his boldness, and with it, he sailed to Erytheia, where he found Eurytheion and his dog Orthos, as well as Geryon and killed them.
Herakles with the cattle sailed to Tartessus and return the golden cup to Helios. From there he sailed through Gaul, Italy, Illyricum, Thrace and had many other adventures.
Finally he succeeded to bring the oxen to king Eurystheus, who sacrificed them to the goddess Hera.

Herakles is fighting with Geryon, amphora 540 BC 

Herakles is fighting Geryon, amphora 550 BC
Exekias, Louvre.