In Greek mythology, Cerberus or Kerberos (Greek Κέρβερος, Kérberos), the ker or daimon of Erebos was the hound of Hades, a monstrous three-headed dog with a snake for a tail and snakes down his back like a mane, whose analogs in other cultures are hellhounds. Other hell hounds included Orthus, his two-headed brother. Cerberus guarded the gate to Hades and ensured that spirits of the dead could enter, but none could exit. Among his siblings are Chimera and the Hydra. He is the offspring of Echidna and Typhon. In Dante's Inferno,, he appears as the guardian of the Circle of Gluttony, and is described as having a beard on each head. Cerberus is often described as once an ordinary pup, when he was mutated and captured by Hades to guard the gates of Tartarus across the river Styx. He has an appetite for live meat/flesh and attacks anyone but spirits. He is Hades's watch-dog.
Cerberus was overcome several times, with the aid of gods or superhuman talents: