Stheno (Greek: Σθεννώ, English translation: "forceful"), in Greek mythology, was the eldest of the Gorgons, vicious female monsters with brass hands, sharp fangs and "hair" made of living venomous snakes. The daughter of Phorcys and Ceto, she was born in the caverns beneath Mount Olympus. She and her sister Euryale were both immortal, and the third sister, Medusa, was mortal.