Medusa in Wikipedia

In Greek mythology Medusa (Greek: Μέδουσα (Médousa), "guardian, protectress")[1] was a Gorgon, a chthonic female monster, and a daughter of Phorcys and Ceto;[2] Only Hyginus, (Fabulae, 151) interposes a generation and gives another chthonic pair as parents of Medusa;[3] gazing directly upon her would turn onlookers to stone. She was beheaded by the hero Perseus, who thereafter used her head as a weapon[4] until he gave it to the goddess Athena to place on her shield. In classical antiquity the image of the head of Medusa appeared in the evil-averting device known as the Gorgoneion...

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