Cerberus is a giant hellhound mentioned throughout Greek mythology. Cerberus is a multi-headed hellhound who is said to guard the gates of Hades, preventing anyone to leave or enter Hades. Cerberus is often said to be one of the many monstrous offspring of the monsters Echidna and Thyphon.
Cerberus is said to be a large dog-like monster with three to four heads(depending on the myth), and a long snake as a tail. Cerberus is mentioned to be the largest and deadliest hellhound.
The Twelfth Labor of Heracles
Cerberus is most notably known for it's role as the twelfth labor of the legendary Greek hero Heracles. As Heracles' twelfth labor, Heracles was ordered by the king of Tirynis, Eurystheus, to bring back to him Cerberus from the underworld. On his journey Heracles was aided by the Greek god Hermes and the goddess Athena. Once at the gates of Hades, Heracles wrestled Cerberus with nothing but a wooden club. Heracles soon tired the beast and brought it back to Eurystheus. After showing the king, Heracles released Cerberus back to Hades.