Cerberus is the hound who guards the entrance to the Greek underworld. His task is not mainly to drag living people into Hades, but to control the boundary so that the dead cannot simply leave and unauthorized visitors cannot pass freely.
Appearance and family
Ancient descriptions do not agree on his number of heads. Hesiod gives him fifty, while later literature and art commonly settle on three. Snakes may form his tail, mane, or surrounding features. The three-headed image is traditional, but it is not the only ancient form.
Hesiod makes Cerberus a child of Echidna and Typhon, placing him in a family of dangerous beings that includes Orthrus, the Hydra, and the Chimera. His monstrous body marks the underworld gate as a boundary beyond ordinary human control.
Heracles and other visitors
The final labor of Heracles requires bringing Cerberus to the upper world. Versions differ over whether Heracles wrestles him, receives permission from Hades, or uses limited equipment. He returns the hound after displaying him.
Orpheus passes Cerberus through music in later accounts, while Aeneas’s guide gives the dog a drugged cake in Virgil’s Roman epic. These episodes show that even a fixed guardian could be overcome under exceptional mythic conditions.