A league that first developed as an alliance of sovereign states in Boeotia, a district in east-central Greece, about 550 B.C., under the leadership of Thebes.The EditorA league that first developed as an alliance of sovereign states in Boeotia, a district in east-central Greece, about 550 B.C., under the leadership of Thebes.your guide for Delphi, the "Navel of the Earth"