The Amphictyonic League was an ancient Greek religious association of neighboring tribes, primarily formed to protect and manage the shared sacred sites, particularly the oracle at Delphi. It aimed to promote cooperation among its members and ensure the proper conduct of religious festivals and rituals. The league consisted of various city-states, including notable members like Thessaly and Boeotia. It played a significant role in the political landscape of ancient Greece, influencing decisions and alliances among its members, especially during conflicts such as the Sacred Wars.