Oh my, so busy today. This post is going to be short, but I hope it will be interesting none the less. I was asked about Pegasos. They wanted to know if the ancient Hellenes worshipped Pegasos, and how he was seen in ancient times.

Mythologically speaking, Pegasos was originally only one winged horse, born from the neck of Médousa when she was beheaded by the hero Perseus. Poseidon, Tamer of Horses, is his father. Hesiod describes in his ‘Theogony’ the curious circumstances of his birth:

"…Medusa who suffered a woeful fate: she was mortal, but the two [of her Gorgon sisters] were undying and grew not old. With her lay the Dark-haired One [Poseidon] in a soft meadow amid spring flowers. And when Perseus cut off her head, there sprang forth great Chrysaor and the horse Pegasus who is so called because he was born near the springs [pegae] of Ocean [Okeanos]; and that other, because he held a golden blade [aor] in his hands. Now Pegasus flew away and left the earth, the mother of flocks, and came to the deathless gods: and he dwells in the house of Zeus and brings to wise Zeus the thunder and lightning." [ll 270-294]

Pegasos was tamed by Bellerophon, a Korinthian hero, who rode him into battle against the fire-breathing Khimaira. Pindar, in his beautiful Olympian Odes describes this cooperation wonderfully:
 
"Bellerophon, who once suffered greatly when beside the spring he wanted to harness Pegasus, the son of the snake-entwined Gorgon; until the maiden Pallas brought to him a bridle with golden cheek-pieces. The dream suddenly became waking reality, and she spoke: “Are you sleeping, king, son of Aeolus? Come, take this charm for the horse; and, sacrificing a white bull, show it to your ancestor, Poseidon the Horse-Tamer.” The goddess of the dark aegis seemed to say such words to him as he slumbered in the darkness, and he leapt straight up to his feet. He seized the marvellous thing that lay beside him, and gladly went to the seer of the land,  and he told the son of Coeranus the whole story: how, at the seer’s bidding, he had gone to sleep for the night on the altar of the goddess, and how the daughter herself of Zeus whose spear is the thunderbolt had given him the spirit-subduing gold. The seer told him to obey the dream with all speed; and, when he sacrificed a strong-footed bull to the widely powerful holder of the earth, straightaway to dedicate an altar to Athena, goddess of horses. The power of the gods accomplishes as a light achievement what is contrary to oaths and expectations. And so mighty Bellerophon eagerly stretched the gentle charmed bridle around its jaws and caught the winged horse. Mounted on its back and armored in bronze, at once he began to play with weapons. And with Pegasus, from the chilly bosom of the lonely air,7 he once attacked the Amazons, the female army of archers, [90] and he killed the fire-breathing Chimaera, and the Solymi. I shall pass over his death in silence; but Pegasus has found his shelter in the ancient stables of Zeus in Olympus." [13. 63]

Pegasos was not worshipped with ritual and sacrifices like the Theoi—the Hellenic Gods—were; only the Theoi were worshipped in that manner, and even then there were huge differences in Ouranic, Khthonic, and hero worship. He/they were featured in art, though, and was/were a beloved part of the Hellenic mythology; especially the Pegasos Bellerophon rode on, as he was featured on many coins throughout the years.