Medusa
In Greek mythology, Medusa (Greek: Μέδουσα, Médousa, "guardian, protectress"), was a monstrous chthonic female character essentially an extension of an apotropaic mask, gazing upon whom could turn onlookers to stone. Secondarily, Medusa was tripled into a trio of sisters, the Gorgons.
Some classical references multiply her into three Gorgon sisters: Medusa, Stheno, and Euryale, monsters with goggling eyes, sharp protruding fangs and lolling tongues, brass hands, and hair of living, venomous snakes. The Gorgons were children of Phorcys and Ceto, or sometimes, Typhon and Echidna, in each case chthonic monsters from an archaic world. Their genealogy is shared with other sisters, the Graiae, as in Aeschylus' Prometheus Unbound, who places both trinities of sisters far off "on Kisthene's dreadful plain"
"Near them their sisters three, the Gorgons, winged With snakes for hair— hated of mortal man—" Perseus with the Head of Medusa.