Battle of Adrianople
1205 CE.
Shown on the map at 41.667°, 26.567°.
The Battle of Adrianople occurred around Adrianople on April 14, 1205, between Bulgarians, Cumans and Vlachs under the command of Tsar Kaloyan of Bulgaria, and Crusaders under Baldwin I, who only months before had been crowned Emperor of Constantinople, allied with Venetians under Doge Enrico Dandolo. The battle was won by the Bulgarian Empire after a successful ambush.
Text from the Wikipedia article Battle of Adrianople (1205), licensed CC BY-SA 4.0.