Battle of Ctesiphon
363 CE.
Shown on the map at 33.100°, 44.583°.
The Battle of Ctesiphon took place on 29 May 363 between the armies of Roman Emperor Julian and an army of the Sasanian Empire (during Shapur II's reign) outside the walls of the Persian capital Ctesiphon. The battle resulted in a Roman victory, but eventually the Roman forces found themselves unable to continue their campaign as they were too far from their supply lines.
Text from the Wikipedia article Battle of Ctesiphon (363), licensed CC BY-SA 4.0.