Cerberus

Cerberus (pronounced /ˈsɜrbərəs/1), or Kerberos, (Greek: Κέρβερος) is a multi-headed hound (usually three-headed) which guards the gates of Hades, to prevent those who have crossed the river Styx from ever escaping. Cerberus featured in many works of ancient Greek and Roman literature and in works of both ancient and modern art and architecture, although, the depiction and background surrounding Cerberus often differed across various works by different authors of the era.