When Julian was elevated to the rank of Caesar by his cousin Constantius II it was for the purpose of countering continuous and destructive Germanic raiding into Roman Gaul. Julian had been brought up – and educated – in isolation in Cappadocia, and had survived the dynastic purges of the Constantinian dynasty by Constantius II. This reality made Julian the only option left for Constantius if he wished to have a member of his own dynasty raised to the position of Caesar – because Constantius had no sons.
Julian was an introverted intellectual with no military background, and was not intended to take on an active role within the campaign against the Germans – i.e. Julian was to act only as a figurehead for Constantius. Unexpectedly, Julian quickly took command of the campaign and achieved staggering battlefield successes in Gaul, as well as in Germany. Later, as sole Emperor of the Roman Empire Julian attempted to roll-back Christianity, and return to the primacy of Roman paganism – which earned him his famous cognomen of ‘the Apostate’ from Christian writers.
“In the years before Julian’s appointment as Caesar the frontier along the Rhine and Upper Danube had been stripped of many of its garrisons as men were drawn off to fight in the civil wars. Roman weakness was confirmed when barbarian raiders were able to penetrate deep into the settled provinces and come back with plunder and glory.
“The army of the fourth century was geared towards warfare on a relatively small scale, an impression which Julian’s operations in Gaul confirm.
“In the third and fourth centuries many communities which had not felt the need of fortifications in the early Principate acquired walls. Simultaneously the army was putting far more effort into constructing strong ramparts and projecting towers around its bases. Defence was a much higher priority than it had been in earlier centuries.
“The Roman plan was to launch a major offensive against the Alamani, Julian attacking from the north and Barbatio from the south. Indirect pressure would also be put on the Alamanni by the Augustus’ own operations from Raetia on the Upper Danube.
“It is difficult to avoid the conclusion that the soldiers of the fourth century were all too aware of their capacity to dispose of any general and replace him with an alternative of their own choosing, and as a result felt very free to express their opinion.
*All excerpts have been taken from In the Name of Rome: The Men Who Won the Roman Empire, Orion Publishing Group.