who defeated the spartans in a war in 371 bc
Battle of Leuctra The Battle of Leuctra (Greek: Λεῦκτρα, Leûktra) was a battle fought on 6 July 371 BC between the Boeotians led by Thebans and the Spartans along with their allies amidst the post-Corinthian War conflict. The battle took place in the neighbourhood of Leuctra, a village in Boeotia in the territory of Thespiae. The Theban victory shattered Sparta’s immense influence over the Greek peninsula, which Sparta had gained since its victory in the Peloponnesian War.