Battle of Déols
469 CE.
Shown on the map at 46.838°, 1.701°.
The Battle of Déols was a battle c. 469 in the Gothic revolt of Euric. With this battle Euric king of the Visigoths thwarted an attack by an alliance of Bretons or Britons of the Romano-British Riothamus and the Gauls.
Text from the Wikipedia article Battle of Déols, licensed CC BY-SA 4.0.