The Underworld is guarded by Cerberus.
The God Osiris was the god of the Underworld.
We are not told in Greek myth.
Cerberus was the hound who guarded those gates.
Cerberus, hound of Hades.
In Greek mythology, the gates of the underworld were guarded by Cerberus, a three-headed dog. Cerberus ensured that the dead could not escape and that the living could not enter without permission. He was often depicted as fierce and loyal, serving as a protector of Hades, the god of the underworld.
Cerberus was a three-headed, dragon-tailed dog who guarded the entrance to the Underworld.
The monster that guards the exit from the Underworld is Cerberus (Kerberos).
Hagrid's hellhound, Fluffy, is an allusion to the Greek guardian hellhound Cerberus, who guarded the Underworld, as Fluffy guarded the Sorcerer's Stone.
Cerberus (The three-headed dog, that guarded the gates of the underworld)[Lernaean] Hydra (A serpent-like creature with many heads)Minotaur (A beast with the body of a human and the head of a bull)tymphalian birds (Birds that feed on humans)
Lycans -
Hades is the god of the Underworld in Greek Mythology. Cerberus was the three-headed dog that guarded the Underworld. They are related by both living in the Underworld. From Atlantis01: actually...hades is a place not a god, Hades is the underworld not the god that rules it. so hades is guarded by Cerberus. From gmully123: actually....yes he is a god. Hades was Zeus and Poseidon's brother and when they defeated the Titans and took over the universe, Hates respectfully became the god of the underworld. While Zeus and Poseidon took the upper world.