In Greek mythology, the term "Aegium" refers to a city in Achaea, known for its association with the goddess Athena. It was believed to be a place where the protective shield, or "aegis," of Zeus and Athena was kept. The aegis symbolized divine protection and power, often depicted as a shield adorned with the head of the Gorgon Medusa. Aegium was also significant in various myths and historical accounts, serving as a center for worship and cultural activities. The city played a role in the Peloponnesian War and was known for its strategic location along the coast, contributing to its importance in ancient Greek society.