Medusa Classic RingThe so called "Rondanini Medusa". Marble, Roman copy of a 5th century BC Greek original by Phidias, which was set on the shield of Athena Parthenos. The Munich Glyptothek's Medusa Rondanini is possibly a 5th century BC work, and the oldest known "beautiful gorgoneion" sculpture. The design may have been copied from a gilded bronze aegis that once hung in the Acropolis, where it would have been meant to ward off evil and bad luck. A revision of the