Siege of Martyropolis
531 CE.
Shown on the map at 38.142°, 41.001°.
A siege of Martyropolis occurred in the Autumn of 531 during the Iberian War between the Sasanian Empire under Kavadh I and the Byzantine Empire under Justinian I. A Roman raid from Martyropolis triggered the Sasanians to launch a siege on the newly fortified frontier city. Although the Sasanians had the upper hand, a series of political developments coupled with logistical issues led them to withdraw. It was the last conflict of the Iberian War.
Text from the Wikipedia article Siege of Martyropolis (531), licensed CC BY-SA 4.0.