Battle of Pantina
1167 CE.
Shown on the map at 42.900°, 20.833°.
The Battle of Pantina was fought between the Byzantine Empire and the Grand Principality of Serbia in 1167. It was part of a war of succession within Serbia, in which the Byzantines intervened on behalf of the deposed Grand Prince Tihomir of Serbia against his rebellious younger brother, Prince Nemanja, who emerged victorious and was crowned afterwards.
Text from the Wikipedia article Battle of Pantina, licensed CC BY-SA 4.0.