Battle of Thessalonica
1040 CE.
Shown on the map at 40.650°, 22.900°.
The battle of Thessalonica (Bulgarian: Битка при Солун) occurred in 1040 near the city of Thessalonica in contemporary Greece between the Bulgarians and the Byzantines. The battle ended with a Bulgarian victory.
Text from the Wikipedia article Battle of Thessalonica (1040), licensed CC BY-SA 4.0.