Domnentiolus (Greek: Δομνεντίολος) was a Byzantine military officer, active in the reign of Justinian I (r. 527–565).
A fragment of Theophanes of Byzantium, preserved by Patriarch Photios, calls him "Comentiolus".
[2] 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.
[1] Procopius continues: "Suddenly, however, Peter, without communicating with anyone, and without any careful consideration, invaded the hostile land with his troops.
And when this in turn came to the knowledge of Martin and Valerian and their men, they quickly joined in the invasion."
[1] Procopius reports on the movements of Justus, Domnentiolus and the others "And all of them a little later united with each other in the enemy's territory, with the exception of Justus and his men, who, as I have said, had encamped far away from the rest of the army, and learned later of their invasion; then, indeed, they also invaded the territory of the enemy as quickly as possible at the point where they were, but failed altogether to unite with the other commanders.
As for the others, they proceeded in a body straight for Doubios, neither plundering nor damaging in any other way the land of the Persians.
[1] Procopius reports: "As for the forces of Justus and Peranius, they invaded the country about Taraunon, and after gathering some little plunder, immediately returned.