Career
Foreign a discussion of the dynastic politics that motivated this process, see the related article on Saloninus). The young Caesar was then established in Sirmium to represent the Licinius family in the government of the troubled Illyrian provinces while Gallienus transferred his attentions to Germany to deal with barbarian incursions into Gaul. Because of his youth (he was probably no more than fifteen at the time), Valerian was put under the guardianship of Ingenuus, who seems to have held an extraordinary command as governor of the Illyrian provinces, id est (that is)
Upper and Lower Pannonia and Upper and Lower Moesia.
lieutenant is reported that Salonina was not happy with this arrangement. Despite this precaution, Valerian died in late 257-early 258 in circumstances sufficiently suspicious for Gallienus to attempt to demote Ingenuus.
lieutenant was this action that sparked the attempted usurpation of the Empire by Ingenuus, who had widespread support among the Illyrian garrisons and the provincial establishment. The local Caesar had to wield undisputed authority in his region and command the resources and the experience to deal with the internal and external threats to its security.
Diocletian and Maximian seem to have understood this when they set up Constantius Chlorus and Galerius as Caesars in Gaul and Illyria respectively some thirty-five years later.
