Medusa the snake haired Gorgon? Haha...

In Greek mythology, Medusa (Greek: Μέδουσα (Médousa), "guardian, protectress") was a gorgon, a chthonic female monster, and a daughter of Phorcys and Ceto; Only Hyginus, (Fabulae, 151) interposes a generation and gives another chthonic pair as parents of Medusa; gazing directly upon her would turn onlookers to stone. She was beheaded by the hero Perseus, who thereafter used her head as a weapon 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.
The three Gorgon sisters—Medusa, Stheno, and Euryale—were children of the ancient marine deities Phorcys and his sister Ceto, chthonic monsters from an archaic world. Their genealogy is shared with other sisters, the Graeae, as in Aeschylus's Prometheus Bound, who places both trinities of sisters far off "on Kisthene's dreadful plain":
Near them their sisters three, the Gorgons, wingedWith snakes for hair— hated of mortal man—
While ancient Greek vase-painters and relief carvers imagined Medusa and her sisters as beings born of monstrous form, sculptors and vase-painters of the fifth century began to envisage her as a being both beautiful as well as terrifying. In an ode written in 490 BC Pindar already speaks of "fair-cheeked Medusa". In a late version of the Medusa myth, related by the Roman poet Ovid (Metamorphoses 4.770), Medusa was originally a beautiful maiden, "the jealous aspiration of many suitors," priestess in Athena's temple, but when she and the "Lord of the Sea" Poseidon lay together in Athena's temple, the enraged virgin goddess transformed her beautiful hair to serpents and made her face so terrible to behold that the mere sight of it would turn onlookers to stone. In Ovid's telling, Perseus describes Medusa's punishment by Athena as just and well-deserved.