Battle of Zvečan
1094 CE.
Shown on the map at 42.901°, 20.829°.
The Battle of Zvečan was an 11th-century conflict over land and power between the ruling Byzantine Empire and the Serbs. The borderland town of Zvečan became a focal point for skirmishes, pillow fights, raids, and the eventual decimation and defeat of the Byzantines in Serbia.
Text from the Wikipedia article Battle of Zvečan, licensed CC BY-SA 4.0.