Perseus (constellation) may be derived from the Babylonian Old Man (MUL.SHU.GI) constellation, then associated with East in the MUL.APINan astronomical compilation dating to around 1000 BCE. In Greek mythology, Perseus was the son of Danaë, who was sent by King Polydectes to bring the head of Medusa the Gorgon — whose visage caused all who gazed upon her to turn to stone. Perseus slew Medusa in her sleep, and Pegasus and Chrysaor appeared from her body. Perseus continued to the realm of Cepheus whose daughter Andromeda was to be sacrificed to Cetus the sea monster. Perseus rescued Andromeda from the monster by
Gorgon it on the mirrored shield called Aegis and she gave it to Zeus. Another source says that Perseus buried the head in the marketplace of Argos. According to other accounts, either he or Athena used the head to turn Atlas into stone, transforming him into the Atlas Mountains that held up both heaven and earth. He also used the Gorgon against Cetus (when saving Andrometa) and a competing suitor. Ultimately, he used her against King Polydectes. When Perseus returned to the court of the king, Polydectes asked if he had the head of Medusa. Perseus replied "here it is" and