In Greek mythology, Zeus’s protective shield was called the aegis.
The aegis was a divine object connected especially with Zeus, although Athena also commonly bears it in Greek art and literature. It could be described as a shield, breastplate, or protective goatskin, depending on the source and period. Its frightening appearance was linked with divine power and the ability to inspire terror in enemies.
In artistic representations, the aegis often carries the head of Medusa. Athena’s version is particularly recognizable because the Gorgon’s head appears on her shield or breastplate. This association helped make the aegis a symbol of protection and authority.
The word later entered English as a metaphor for protection or sponsorship. It is separate from Zeus’s thunderbolt, which was his weapon, and from Hermes’s caduceus, which was his staff.