Battle of Strumica
1014 CE.
Shown on the map at 41.433°, 22.633°.
The Battle of Strumica took place in August 1014, near Strumica (or Strumitsa), present-day North Macedonia, between Bulgarian and Byzantine forces. Bulgarian troops under Emperor Samuil's son Gavril Radomir defeated the army of the governor of Thessaloniki, Theophylactus Botaniates, who perished in the battle. After his death the Byzantine Emperor Basil II was forced to pull back from Bulgaria and was unable to take advantage of his success in the recent Battle of Kleidion.
Text from the Wikipedia article Battle of Strumica, licensed CC BY-SA 4.0.