A daughter of Uranus and Gaia. She is the personified goddess of Mt. Etna, a volcano on Sicily. Underneath this volcano the giant Typhon lies buried (which explains the volcanic eruptions). When Hephaestus and Demeter were arguing over Sicily, land of volcanoes and corn, Aetna stepped in to act as arbitrator. She is sometimes regarded as the mother of the Palici, the twin Sicilian gods of geysers.