Aegis

Aegis is a shield that has the face of Medusa on it. It is often used by Zeus and his daughter Athena. A replica of the original shield is owned by Azon Komnenos.
Aegis also refers to Athena's protective cloak.
==History==
The shield was originally made by Hephaestus, using the head of Medusa as an imprint on the face after Perseus turned over Medusa's head to Athena. The shield itself was shared between Athena and Zeus after its creation, though other gods have also been known to carry the shield, including Apollo who Zeus sent to retrieve the injured Hector of Troy from the Achaeans.
Athena has given parts of Aegis to her favored heroes in the past. Throughout history, other people (such as Alexander the Great) would imprint the face of Medusa onto their armor in the hopes of replicating the effects of Aegis.