Medusa

In a late myth, Medusa, unlike her sister Gorgons, came to be viewed by the Greeks of the 5th century as a beautiful mortal that served as priestess in Athena's temple. Poseidon liked Medusa, and decided to rape her in the temple of Athena, refusing to allow her vow of chastity to stand in his way. Upon discovering the desecration of her temple, Athena changed Medusa's form to match that of her sister Gorgons as punishment. Medusa's hair turned into snakes, her lower body was transformed also, and meting her gaze would turn any living man to stone.