Pegasus

Pegasus, the winged horse of mythology, was the offspring of Poseidon and Medusa, springing from the latter's body when her head was cut off by Perseus. Bellerophon rode upon him to his encounter with Chimera, and then attempted to fly to Heaven, but was thrown by Pegasus, whom a gadfly stung. With a stroke of his hoof Pegasus gave rise to the spring Hippocrene in Mount Helicon. He is said to have been fixed in the heavens as a constellation.