Pegasus is a winged horse. He was born when Perseus cut off Medusa's head .
In myths, Pegasus is the immortal son of the sea god Poseidon and Medusa. After Medusa was slain by the hero Perseus, Pegasus sprang up from her decapitated neck stump. Eventually, with the aid of Athena, the hero Bellerophon captured him. With his aid, Bellerophon was able to slay the Chimera