Medusa, Greek Mythology

Medusa was a monster, one of the Gorgon sisters and daughter of Phorkys and Keto, the children of Gaea (Earth) and Oceanus (Ocean). She had the face of an ugly woman with snakes instead of hair; anyone who looked into her eyes was immediately turned to stone. Her sisters were Sthenno and Euryale, but Medusa was the only mortal of the three.