Tartarus

Tartarus (Ancient Greek: Ταρταρος) was the Greek primordial god of the Tartarean pit in the Underworld. It was stated that it would take a bronze anvil nine days to fall from heaven to earth and an additional nine days to fall from earth to the bottom of Tartarus. Tartarus came into existence shortly after the creation fo the universe and after the creation of Chaos and Gaea, thus having no parents. He was the father of Typhon by Gaea.

Mythology
Tartarus was used as a place where mortals and deities were imprisoned and punished. After Gaea gave birth to the Hecatoncheires and the Cyclopes, Uranus threw them into Tartarus because he thought they were hideous. He sent Campe to guard them. Zeus eventually killed Campe and released the Hecatoncheires and Cyclopes from their prison. After the Titanomachy, Zeus threw Cronus, Iapetus, Coeus, Oceanus, Hyperion, and Crius into Tartarus. Zeus set the Hecatoncheires as guards of Tartarus.

Other inmates of Tartarus include Sisyphus, Tantalus, Ixion, the Danaides, Tityus, and Salmoneus.