After Perseus saved Andromeda, who was tied to a reef to be eaten by an aquatic monster (which he turned to stone with Medusa's head), he married her and returned to island where his mother was to be found. His mother had fled to a temple to avoid the king. The king did not believe Perseus and therefore was turned to stone when he showed him Medusa's head. Years later, during a javelin and discus competition, Perseus struck Acrisius and accidentally killed him thus fulfilling the oracle. The head of the Gorgon was given to Athena and she placed it on her own aegis.
