Sample Lesson Monsters in Greek Mythology Argus Argus may have had as many as one hundred eyes, which were located all over his body. Hera employed him as a guard. He was killed by Hermes. Afterward, Hera put Argus's eyes in the tail of the peacock, her favorite bird. Cerberus Cerberus was a huge and powerful three-headed dog. He was owned by Hades, god of the dead, who used the fearsome hound to guard the entrance to the underworld. In his final labor, Hercules went to the underworld and kidnapped Cerberus. Cyclopes Each of the Cyclopes was gigantic and had a single eye in the middle of its forehead. The Cyclopes made lightning and thunderbolts for Zeus to use. The brutal Polyphemus, a Cyclops and a son of Poseidon, lived on an island, where he was blinded by Odysseus. Gorgons The Gorgons were horrifyingly ugly monsters who lived at the edge of the world. Their hair was made of serpents, and one look from a Gorgon's eyes would turn a man to stone. Perseus killed the Gorgon Medusa by beheading her while looking only at her reflection.