Governor of Pannonia Secunda, A.D. 361, and praefectus urbi, A.D. 389. He wrote Caesares, a history of the Roman emperors from Augustus to Constantius (360). The Origo Gentis Romanae and De Viris Illustribus, associated with the Caesares in a Historia tripartita, are falsely attributed to him; as also the Epitome de Caesaribus (up to Theodosius I, A.D. 395), which at first follows the Caesares.