Siege of Sozopolis
1120 CE.
Shown on the map at 38.073°, 30.467°.
The siege of Sozopolis saw the Byzantine Empire conquest of the Seljuk dynasty-held town of Sozopolis in 1120, improving byzantine communications with the city of Attaleia.
Text from the Wikipedia article Siege of Sozopolis, licensed CC BY-SA 4.0.