The Aegean League was a confederation of city-states in the Aegean Sea during the Hellenistic period, primarily formed in the 3rd century BCE. It aimed to promote mutual defense and cooperation among its members, which included various Greek cities and islands. The league was significant for its role in regional politics and trade. The Aegean League was often in conflict with other powers, such as the Macedonian Empire and the Roman Republic. Its influence waned over time, especially as larger empires expanded their control over the Aegean region, leading to the eventual dissolution of the league.