He could see ghosts, and evidently kept them within the Underworld.
Cerberus
The name Cerberus is Roman already. It's a latinisation of Kerberos, which is the Greek name.
Type your answer here... Yes, he is a two headed dog that guards the passage to the underword
What? The mythical Greek monster? Green.
A six-headed creature with the legs and bark of a dog is a mythical beast known as the Cerberus. In Greek mythology, Cerberus is a multi-headed dog that guards the entrance to the underworld to prevent the dead from escaping and the living from entering.
In Greek myth, Cerberus was a three-headed dog that guarded the entrance to Hades.
Any stories involving the Underworld. Cerberus was the three-headed guardian of the entrance to Hades.
Creating monaters
I believe, if my Greek mythology is correct, it was the Minotar.
Cerberus is the three-headed dog that guards the gates of the Underworld. Psyche, in her task to get the box of beauty from the goddess Proserpine, has to get past Cerberus. She is instructed by a Tower and gives him cake so he will let her pass.
Cerberus is apart of the Greek mythology.
Cerberus is often depicted as a three-headed dog in Greek mythology, guarding the entrance to the underworld. It is not associated with any specific breed of dog, but its imagery is mythical and symbolic rather than based on a real dog breed.