In Greek mythology, Pegasus (meaning ‘lightening’) was a winged horse sired by Poseidon, in his role as horse-god. Born of the sea, formed from the mingling of Medusa’s blood (after being beheaded) and sea foam, implying that Poseidon had involvement in his making.
Pegasus brought the thunder and lightening to Zeus whenever he wished to use it, and never once did Pegasus fail to be quick, nor did he slip and drop the weapons, serving the god faithfully until his last day.
Pegasus was a mortal, but because of his faithful service Zeus honoured by transforming him into a constellation. On the last day of his life, when he was transformed, a single feather fell to the earth near the city of Tarsus.