Publius Licinius Valerianus Egnatius Gallienus

Gallienus, Publius Licinius Valerianus Egnatius (A.D. 218?–268), Roman emperor (253–268). He ruled with his father, Valerian, until Valerian's capture by the Persians in 260. Under pressure from German, Persian, and Gothic invasions and provincial revolutions, Gallienus reorganized the army and reduced the power of the Senate. He also ended official persecution of the Christians. Gallienus was assassinated in Milan while quelling a revolt.