(Κέρβερος), the three-headed hound who guarded the gates of Hadessources: https://en.wikipedia.org/wiki/List_of_Greek_mythological_figures#Chthonic_deities
In Greek mythology, Cerberus (/ˈsɜːrbərəs/; Greek: Κέρβερος Kerberos [ˈkerberos]), often called the “hound of Hades“, is a monstrous multi-headed dog, who guards the gates of the underworld, preventing the dead from leaving. He was the offspring of the monsters Echidna and Typhon, and is usually described as having three heads, a serpent for a tail, with snakes protruding from various parts of his body. Cerberus is primarily known for his capture by Heracles, one of Heracles’ twelve labours.
Descriptions of Cerberus vary, including the number of his heads. Cerberus was usually three-headed, though not always. Cerberus had a multi-headed heritage. His father was the multi snake-headed Typhon, and Cerberus was the brother of three other multi-headed monsters, the multi-snake-headed Lernaean Hydra; Orthrus, the two-headed dog who guarded the Cattle of Geryon; and the Chimera, who had three heads, that of a lion, a goat, and a snake. And, like these close relatives, Cerberus was, with only the rare iconographic exception, multi-headed.
In the earliest description of Cerberus, Hesiod‘s Theogony (c. 8th – 7th century BC), Cerberus has fifty heads, while Pindar (c. 522 – c. 443 BC) gave him one hundred heads. However, later writers almost universally give Cerberus three heads. An exception is the Latin poet Horace‘s Cerberus which has a single dog head, and one hundred snake heads. Perhaps trying to reconcile these competing traditions, Apollodorus‘s Cerberus has three dog heads and the heads of “all sorts of snakes” along his back, while the Byzantine poet John Tzetzes (who probably based his account on Apollodorus) gives Cerberus fifty heads, three of which were dog heads, the rest being the “heads of other beasts of all sorts”.
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