Protectores Augusti Nostri

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Protector Augusti Nostri (lit 'Protector of Our Augustus') was a title given to individual officers of the Roman army as a mark of their devotion to and approval by the Emperor himself. The term first appears with this meaning in the joint-reign of Valerian and Gallienus. Lucius Petronius Taurus Volusianus was the first recorded Protector appointed by Gallienus.