Battle of Katasyrtai
917 CE.
Shown on the map at 41.031°, 28.890°.
The battle of Katasyrtai (Kατασυρται) occurred in the fall of 917, shortly after the striking Bulgarian triumph at Achelous near the village of the same name close to the Byzantine capital Constantinople, (now Istanbul). The result was a Bulgarian victory.
Text from the Wikipedia article Battle of Katasyrtai, licensed CC BY-SA 4.0.