Justin (Latin: Justinus; Greek: Ἰουστῖνος) was a 6th-century East Roman (Byzantine) general, who was active in the Gothic War in Italy under Justinian I (r. 527–565).
[1][2] In the dissension that broke out in the Byzantine army between Belisarius and Narses, Justin sided with the latter, and accompanied him to the relief of the Gothic siege of Ariminum, defended by the general John.
After the successful outcome of the operation, along with John, Justin proceeded to occupy the region of Aemilia against little Gothic resistance during the winter of 538/539.
After leaving a small detachment to guard Florence, Justin with his own men joined the other three generals and marched north in pursuit of the Goths.
The Byzantine generals dispersed to fortified places across central Italy and henceforth failed to cooperate; Justin himself returned to the safety of Florence.