The Underworld is guarded by Cerberus.
The Underworld is known to be guarded by Cerberus.
Cerberus was a three-headed, dragon-tailed dog who guarded the entrance to the Underworld.
In Greek myth, Cerberus was a three-headed dog that guarded the entrance to Hades.
Cerberus
Cerberus.
Cerberus.
Cerberus.
We are not told in Greek myth.
Cerberus
Cerberus was the dog that guarded the kingdom of Hades. So Hercules had to go to the Underworld.
That was trusty, three-headed Cerberus.
Cerberus was the hound who guarded those gates.