Siege of Phasis
555 CE.
Shown on the map at 42.150°, 41.667°.
The siege of Phasis took place in 555–556 during the Lazic War between the Byzantine and Sasanian Empires. Expecting an easy victory, the Persians besieged the town of Phasis in Lazica, held by the Byzantines, but were defeated in the ensuing irregular battle. The main source for the siege is the 6th-century historian Agathias.
Text from the Wikipedia article Siege of Phasis, licensed CC BY-SA 4.0.