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.

Battle of Thessalonica
Thessaloniki area in Antiquity
Date summer or autumn 380 AD Location near Thessalonica, Macedonia Result Gothic victory
Belligerents
Eastern Roman Empire	Goths
Commanders and leaders
Theodosius I	Fritigern