Battle of Thessalonica
380 CE.
Shown on the map at 40.640°, 22.944°.
The Battle of Thessalonica was fought in the summer or autumn of 380 by Fritigern's Goths and a Roman army led by Theodosius I. Reconstituted after Adrianople, the East Roman army suffered another major defeat. Theodosius retreated to Thessalonica and surrendered control of operations to the Western Emperor, Gratian.
Text from the Wikipedia article Battle of Thessalonica (380), licensed CC BY-SA 4.0.