The Gorgons ( GOR-gənz; Ancient Greek: Γοργώνες), in Greek mythology, are three monstrous sisters, Stheno, Euryale, and Medusa, said to be the daughters of Phorcys and Ceto. They lived near their sisters the Graeae, and were able to turn anyone who looked at them to stone. Euryale and Stheno were immortal, but Medusa was not and was slain by the hero Perseus. Gorgons were dread monsters with terrifying eyes. A Gorgon head was displayed on Athena's aegis, giving it the power both to protect her from any weapon, and instill great fear in any enemy.
https://en.wikipedia.org/wiki/Gorgons