Mauricae gentes Africam populantur. Isaurorum latrocinia Valens compescit. De Praetextati urbana praefectura (‘Moorish tribes raid Africa. Valens quashes the brigandage of the Isaurians. On Praetextatus’ urban prefecture’).
In chapter 2 of book 28, after describing the western emperor Valentinian’s fortification works on the Rhine, and a Roman military defeat at Mons Pirus in Germany, he describes the Maratocupreni in Syria: a group of bandits within the Roman empire on the same lines as the Isaurians, though clearly a rather smaller group. Their most outrageous assault was to enter a city at nightfall disguised as a taxation official and his retinue, claiming that a wealthy citizen had been sentenced to death and his goods confiscated; they gained access to his house and after murders and looting left before daybreak. As has been remarked, the success of the gambit is a sobering reminder of what behaviour provincials thought was possible in imperial officials. Then the bandits are ambushed and massacred, including their children, and their village razed to the ground. The capitulum describes the events as follows:
…Maratocupreni grassatores in Syria jussu Valentis Augusti cum liberis et vico suo deleti (‘The Maratocupreni, raiders in Syria, are destroyed along with their children and their village on the orders of Valens Augustus’).
The difference also points out what Ammianus is doing in his account of with Valens. Narratives of western military affairs in the later books are full of Valentinian’s involvement and planning alongside the successes and failures of individual generals; Ammianus takes the western emperor’s military achievements seriously, as modern scholars don’t always, and admires him for them. By contrast, the account of Valens’ first Gothic war (27.5) is a derisively brief account of uneventful and pointless campaigns; when serious military action happens in the east during Valens’ reign it almost always involves his generals. The emperor himself is only ever tangentially involved—and when he does get seriously involved, at the battle of Adrianople in 378, calamity ensues. The absence of Valens’ name in the account of the Maratocupreni in 28.2 – when he seems to have taken brutal and effective action – is not an oversight, but an intentional omission.