Pegasus, in Greek myth, a winged horse who, with his brother Chrysaor, was sprung from the blood of the Gorgon Medusa, pregnant by Poseidon, when she was killed by Perseus. The fountain Hippocrene on Mount Helicon in Boeotia, sacred to the Muses, was said to have been produced by a stamp of his hoof. With divine aid Bellerophon was able to catch this horse when it was drinking at the fountain Peirēnē in Corinth, and bridle it. Mounted on it he succeeded in killing the Chimaera, but was thrown when he attempted to fly to Olympus on its back. Pegasus appears on a handsome series of Corinthian coins, symbolizing the city.