Tartarus (or Tartaros) was the Protogenoi (Primordial god) of the stormy Tartarean Pit that lays beneath Earth (Hell), as well as torment and divine punishment. He was one of the first to emerge when the Universe was created, after Khaos and Gaia.
Tartaros had two children, the giants Typhoeus (Typhon) and Echidna. Aswell as the giants born to fight the Gods ( Echidna, Aloadai, etc.).