List of Late Roman provinces
The list of Roman provinces from Diocletian is tabulated represent the essential information for the development of the Roman regional structure after the administrative reform of Emperor Diocletian to the division of the kingdom of 395, when the division took place in the Western Roman Empire and the Eastern Roman Empire. The information on the development of Roman regional structure to the administrative reform of Diocletian set out in the List of Roman provinces to Diocletian. An alphabetical list of all the Roman provinces regardless of the time of its existence can be found in List of Provinces of the Roman Empire.
With the administrative reforms of Diocletian and his successors mostly smaller units were formed from the 46 provinces so far mainly by division 85; only in one case provinces were merged (Alpes and Alpes Graiae Poeninae to Graiae Alpes et Poeninae ), also there were no major border shifts ( Exception: Maritimae Alpes, which was extended to parts of Gallia Narbonensis and Alpes Cottiae ). An essential feature of the reform was still that the Italian peninsula, which so far had the privilege not to be among the provinces was divided into eight units. In another reform, the number of now 93 provinces was increased to 119, wherein this time especially divisions and only one merging took place ( Numidia Numidia and Cirtensis Militiane to Numidia ), which is, however, only to the withdrawal of a previous division acted.
The more than doubling the number of provinces required the introduction of an additional level of hierarchy, the combination of individual provinces to dioceses. Under Emperor Constantine I, the decoupled from their military duties were entrusted praetorian prefect as another administrative level with civilian tasks.
The hierarchy levels
Thus by the end of the 4th century, the Roman Empire had the following regional hierarchy:
- 3rd level: the dioceses
- 4th level: the provinces
The division of the kingdom in the year 395 had consequences for the prefect, as the Prefecture " Illyricum, Italia et Africa" had to be shared. To the Western Roman Empire then belonged to the Praefectus Praetorian Praetorian Galliarum and a Praefectus Italiae et Africae, to the Eastern Roman Empire Praefectus Praetorian by orientem and a Praefectus Praetorian Illyrici.