In Greek mythology, Poseidon was the father of Pegasus and Chrysaor, the children born from Medusa.
Medusa’s story does not end with her death. Ancient and later accounts connect her with Poseidon, and when Perseus cut off her head, Pegasus and Chrysaor emerged from her body. This unusual birth explains why both figures are linked to Medusa even though they are not Gorgons.
Pegasus is the famous winged horse. Chrysaor, whose name means “golden sword” in Greek, is a less familiar figure who appears in genealogical myths and is associated with the giant Geryon in later tradition. The two brothers therefore represent very different branches of Greek myth.
Poseidon should not be confused with Phorcys. Phorcys was Medusa’s father in the Gorgon genealogy, while Poseidon was the father of her children. This distinction is one of the most common points of confusion in summaries of the Perseus myth.