"In Greek mythology, Cerberus (/ˈsɜːrbərəs/; Greek: Κέρβερος Kérberos [ˈkerberos]), often called the "hound of Hades", is a multi-headed dog that guards the gates of the Underworld ...
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to prevent the dead from leaving. Cerberus was the offspring of the monsters Echidna and Typhon, and is usually described as having three heads, a serpent for a tail, and snakes protruding from multiple parts of his body. Cerberus is primarily known for his capture by Heracles, one of Heracles´ twelve labours." - (en.wikipedia.org 30.01.2020)