According to Hesiod's "Theogony", Typhon "was joined in love" to Echidna, a monstrous half-woman and half-snake, who bore Typhon "fierce offspring". First, according to Hesiod, there was Orthrus, the two-headed dog who guarded the Cattle of Geryon, second Cerberus, the multiheaded dog who guarded the gates of Hades, and third the Lernaean Hydra, the many-headed serpent who, when one of its heads was cut off, grew two more. The "Theogony" next mentions an ambiguous "she", which might refer to Echidna, as the mother of the Chimera (a fire-breathing beast that was part lion, part goat, and had a snake-headed tail) with Typhon then being the father.