He resurfaces in 543 as one of the commanders of the Byzantine army in Lazic War. Domnentiolus, Justus, Peranius, John, son of Nicetas and John the Glutton led their combined forces to Phison, near Martyropolis, and from there to the Persian border. Procopius reports: "And Justus, the emperor's nephew, and Peranius and John, the son of Nicetas, together with Domentiolus and John, who was called the Glutton, made camp near the place called Phison, which is close by the boundaries of Martyropolis. Thus then were encamped the Roman commanders with their troops; and the whole army amounted to thirty thousand men. Now all these troops were neither gathered into one place, nor indeed was there any general meeting for conference. But the generals sent to each other some of their followers and began to make enquiries concerning the invasion."