The Boeotian League was a confederation of city-states in ancient Greece, primarily located in the region of Boeotia. Established in the 5th century BCE, it aimed to provide mutual defense and promote cooperation among its members, which included cities like Thebes, Thespiae, and Plataea. The League played a significant role in regional politics and military affairs, especially during conflicts such as the Peloponnesian War. The League was governed by a council, where representatives from member cities would meet to make decisions. Over time, the influence of the League fluctuated, particularly as Thebes rose to prominence. The Boeotian League ultimately declined after its defeat by the Macedonians in the 4th century BCE, marking the end of its political significance.