Can you tell us how is the Roman identity at this point in the Raetia, Noricum, Dalmatia, Britania, the Rhenish border region, and Mauretania?
Raetia and Noricum: the region has been recovered by Nepos 50 years ago (chapter X-XIII). The region has never been the seat of any major romano-barbarian kingdom (unlike Gaul, Hispania and Africa), however for some years ties between the locals and Rome had been effectively severed. Following Nepos’ campaign in the North, restoration of communication between Italy and the North and the resettlement of the cities (key points for the Roman administration) with both rural Raetians/Noricans and colonist from Italy, Roman authority can be considered completely restored.
Dalmatia: the region had experienced autonomy from Rome since Valentian’s death. An autonomy closely associated with Marcellinus first and Nepos later. Therefore the Dalmatians can be considered completely loyal to the current dynasty. The province also served as a springboard for the reconquest of Italy 50 years ago. This explain why Marcianus entrusted the command of the Illyrian army to Agricola (Ecdicius’ grandson), a man whose family faithfully served the Nepotians so far.
Britannia: I’ve to be honest, I know little of this region after Constantine III. However the empire is not able to influence the course of events that far, so I would expect minimal differences compared to OTL.
Along the Rhine: this territory as always been subjected to Germanic raids but more importantly has always been inhabited by people of Germanic origin. This only increased during the IV century (way before the beginning of this timeline) with the partial collapse of the frontier after Magnentius’ death and the subsequent Germanic invasion. Julian settled/allowed some of them to remain in Gaul where they acted as a buffer between Gaul and hostile tribes. Many of them had a remarkable career afterward. During the collapse of Roman Gaul, the Franks acted on behalf of the empire before finally taking over Gaul. Therefore the process of “Germanization” of the territory along the Rhine already has a long history.
Mauretania: well this is the subject of a future update/updates so I don’t want to spoiler too much. Roman identity is stronger along the coast and in the main cities of Mauretania, which is divided among many different rulers. Some of them oppose or will oppose Rome in the near future, but they are doing so while adopting Roman-style title and perceiving themselves as Romans. Therefore you could compare them to the many provincial usurpers who popped up during the III century, eventhough on a smaller scale, with the ambitions to forge their own empire like Postumus in Gaul and Gregory in Africa did.
I hope this is enough for now.
Excellent job ..... Finally caught up
Thank you for your appreciation!