In Greek mythology, Echidna was a monster, half-woman and half-snake, who lived alone in a cave. She was the mate of the fearsome monster Typhon and was the mother of many of the most famous monsters of Greek myth.

Typhon, also Typhoeus, Typhaon or Typhos, was a monstrous serpentine giant and one of the deadliest creatures in Greek mythology. According to Hesiod, Typhon was the son of Gaia and Tartarus. However, one source has Typhon as the son of Hera alone, while another makes Typhon the offspring of Cronus. Typhon and his mate Echidna were the progenitors of many famous monsters.