The Myth Behind Delphinus
Poseidon needed to find a wife who would be able to live in the depths of the sea and had people look everywhere to find his new wife. When he finally found his true love Amphitrite she ran to the Atlas Mt. So he sent creatures of the sea to bring her to him. One of those creatures was a dolphin. This dolphin brought the two together and as a gift Poseidon put the dolphin in the stars.
It is made out of 5 stars. Some of the stars are Sulocin and Rotanev.
The brightest star in the constellation is Rotanev, Beta Delphini.