Cerberus or Kerberos, (Greek form: Κέρβερος) in Greek and Roman mythology, is a multi-headed (usually three-headed) dog, or "hellhound" which guards the gates of the Underworld, to prevent those who have crossed the river Styx from ever escaping.
The god of fire and metalworking. He was born disfigured, and his parentals through him out of Olympus, which was quite shameful, if you ask me. He was in an arranged marriage to Aphrodite. She wasn't too keen about all the soot. What a priss.