Cerberus
In Greek mythology, Cerberus (Greek: Κέρβερος, Kérberos; Latin: Cerberus) is the monstrous, multi-headed dog that guards the entrance to the Underworld, preventing the souls of the dead from leaving.
Often called the "hound of Hades", Cerberus was one of the numerous offspring of the monsters Typhon and Echidna; he is usually depicted as having three heads, along with a serpent for a tail. Cerberus is primarily known for being captured by Herakles, as the last of the hero's Twelve Labors.
Cerberus Media
Heracles, wearing his characteristic lion-skin, club in right hand, leash in left, presenting a three-headed Cerberus, snakes coiling from his snouts, necks and front paws, to a frightened Eurystheus hiding in a giant pot. Caeretan hydria (c. 530 BC) from Caere (Louvre E701).
Cerberus and Hades/Serapis. Heraklion Archaeological Museum, Crete, Greece.
Heracles, chain in left hand, his club laid aside, calms a two-headed Cerberus, which has a snake protruding from each of his heads, a mane down his necks and back, and a snake tail. Cerberus is emerging from a portico, which represents the palace of Hades in the underworld. Between them, a tree represents the sacred grove of Hades' wife Persephone. On the far left, Athena stands, left arm extended.
Athena, Hermes and Heracles, leading a two-headed Cerberus out of the underworld, as Persephone looks on. Hydria (c. 550–500 BC) attributed to the Leagros Group (Louvre CA 2992).
Hercules and Cerberus. Oil on canvas, by Peter Paul Rubens 1636, Prado Museum.
One of the two earliest depictions of the capture of Cerberus (composed of the last five figures on the right) shows, from right to left: Cerberus, with a single dog head and snakes rising from his body, fleeing right, Hermes, with his characteristic hat (petasos) and caduceus, Heracles, with quiver on his back, stone in left hand, and bow in right, a goddess, standing in front of Hades' throne, facing Heracles, and Hades, with scepter, fleeing left. Drawing of a lost Corinthian cup (c. 590–580 BC) from Argos.
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Media related to Cerberus (mythology) at Wikimedia Commons