According to legend, everywhere the winged horse struck his hoof to the earth, an inspiring water spring burst forth. One of these springs was upon the Muses' Mount Helicon, the Hippocrene (horse spring), opened, Antoninus Liberalis suggested, at the behest of Poseidon to prevent the mountain swelling with rapture at the song of the Muses; another was at Troezen. Hesiod relates how Pegasus was peacefully drinking from a spring when the hero Bellerophon captured him. Hesiod also says Pegasus carried thunderbolts for Zeus.