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.
What? The mythical Greek monster? Green.
Type your answer here... Yes, he is a two headed dog that guards the passage to the underword
In Greek myth, Cerberus was a three-headed dog that guarded the entrance to Hades.
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.
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.
The Roman and Greek names were the same: Cerberus.