Pegasus was the offspring of Poseidon, the sea god, and Medusa, the Monster.
Pegasus and Bellorophon, its rider, carried out many legendary exploits.
In their last adventure, Bellorophon attempted to ride Pegasus to the summit of Mount Olympus to be among the Gods.
He will never make it, falling before reaching the summit.
While Zeus will turn Pegasus into a constellation making it eternal.