(Greek mythology) Sthenno or Stheno is the eldest of the Gorgons (vicious female monsters) in Greek Mythology. Medusa is one of the most famous Gorgon monsters from Greek mythology. Sthenno is described as having brass hands, sharp fangs, and hair of living snakes like Medusa.
Sthenno is the daughter of Phorcys and Ceto. Sthenno was born in the great caverns beneath Mount Olympus. Sthenno and her sister Euryale were both immortal while the third sister, Medusa, was mortal.