Battle of Conquereuil
992 CE.
Shown on the map at 47.625°, -1.750°.
The Battle of Conquereuil was fought on June 27, 992 AD between the Bretons under Conan I, Duke of Brittany and the Angevins under Fulk the Black.
Text from the Wikipedia article Battle of Conquereuil, licensed CC BY-SA 4.0.