List of Late Roman provinces

This article presents a list of Roman provinces in the Late Roman Empire, as found in the Notitia Dignitatum.

Diocese of Gallia

In Latin, Gallia was also sometimes used as a general term for all Celtic peoples and their territories, such as all Brythons, including Germanic and Iberian provinces that also had a population with a Celtic culture. The plural, Galliarum in Latin, indicates that all of these are meant,^{[citation needed]} not just Caesar's Gaul (several modern countries).

Gallia covered about half of the Gallic provinces of the early empire:

in what is now northern and central France, roughly the part north of the Loire (called after the capital Lugdunum, modern Lyon)
- Belgica II
- Lugdunensis I
- Lugdunensis II
- Lugdunensis III
- Lugdunensis IV Senonia
in Belgium, Luxembourg, part of present-day Netherlands (below the Rhine), on the left bank (west) of the Rhine
- Germania II
- Belgica II
in what are now parts of France and Germany on the western bank of the Rhine
- Belgica I
- Belgica II
- Germania I
- Germania II
in what are now parts of France and Switzerland:
- Alpes Poeninae et Graiae
- Maxima Sequanorum

Diocesis Viennensis

The diocese of Vienna was named after the city of Vienna (now Vienne), and almost entirely in present-day France, roughly south of the Loire. It was originally part of Caesar's newly conquered province of Transalpine Gaul,^{[citation needed]} but a separate diocese from the start.

In the fifth century, Viennensis was replaced by a diocese of Septem Provinciae ('7 Provinces') with similar boundaries.

Diocese of Hispania

Hispania was the name of the whole Iberian Peninsula. It covered Hispania and the westernmost province of Roman Africa:

Baetica
Hispania Balearica (the Mediterranean islands)
Carthaginiensis
Tarraconensis
Gallaecia
Lusitania
Mauretania Tingitana or Hispania Nova, in North Africa

Diocese of Britannia

Praetorian prefecture of Italy and Africa (western)

Originally there was a single diocese of Italia, but it was eventually split into a northern section and a southern section. The division of Italy into regions had already been established by Aurelian.

Diocese of Italia suburbicaria

Suburbicaria indicates proximity to Rome, the Urbs (capital city). It included the islands, which were previously considered outside Italy.

Diocese of Italia annonaria

Annonaria refers to a reliance on the area for the provisioning of Rome. It encompassed northern Italy and Raetia.

Diocese of Africa

Africa included the central part of Roman North Africa:

Praetorian Prefecture of Illyricum

The Prefecture of Illyricum was named after the former province of Illyricum. It originally included two dioceses, the Diocese of Pannonia and the Diocese of Moesia. Constantine I later split the Diocese of Moesia into two dioceses: the Diocese of Macedonia and the Diocese of Dacia.

Diocese of Pannonia

Pannonia was one of the two dioceses in the eastern quarters of the Tetrarchy not belonging to the cultural Greek half of the empire (the other was Dacia); It was transferred to the western empire when Theodosius I fixed the final split of the two empires in 395.

Diocese of Dacia

The Dacians had lived in the Transylvania area, annexed to the Empire by Trajan. However, during the invasions of the third century Dacia was largely abandoned^[why?]. Some inhabitants evacuated from the abandoned province settled on the south side of the Danube. They renamed their new homeland Dacia to diminish the impact that abandoning the original Dacia had on the Empire's prestige. The diocese was transferred to the western empire in 384 by Theodosius I, probably in partial compensation to the empress Justina for his recognition of the usurpation of Magnus Maximus in Britannia, Gaul and Hispania.

Diocese of Macedonia

The Diocese of Macedonia was transferred to the western empire in 384 by Theodosius I, probably in partial compensation to the empress Justina for his recognition of the usurpation of Magnus Maximus in Britannia, Gaul and Hispania.

Macedonia Prima
Macedonia Salutaris (or Macedonia Secunda)
Thessalia
Epirus vetus
Epirus nova
Achaea
Creta

Praetorian Prefecture of Oriens

As the rich home territory of the eastern emperor, the Oriens ("East") prefecture would persist as the core of the Byzantine Empire long after the fall of Rome. Its praetorian prefect would be the last to survive, but his office was transformed into an essentially internal minister, stripped of its original military function.

Diocese of Thrace

Thrace was the easternmost corner of the Balkans (the only part outside the Illyricum prefecture) and the European hinterland of Constantinople.

Diocese of Asia

Asia (or Asia Minor) in Antiquity stood for Anatolia. This diocese (the name means 'the Asian ones') centred on the earlier Roman province of Asia, and only covered the rich western part of the peninsula, mainly near the Aegean Sea.

Asia
Hellespontus (i.e. near the Sea of Marmara, so closest to Greece)
Pamphylia
Caria
Lydia
Lycia
Lycaonia
Pisidia
Phrygia I Pacatiana · Phrygia II Salutaris
the adjoining Aegean islands in the province Insulae

Diocese of Pontus

Pontus is the Latinized form of Greek Pontos, the name of a Hellenistic kingdom, which in turn is derived from the Euxine Pontus, the Greco-Roman name of the Black Sea.

It mainly contains parts of Asia minor near those coasts (as well as the mountainous centre), but also includes the north of very variable border with Rome's enemy Parthia/Persia.

Diocese of Oriens

The Eastern diocese shared its geographic name with the prefecture it belonged to, even after it lost its richest part, Egypt, becoming a separate diocese; but militarily crucial on the Persian (Sassanid) border and unruly desert tribes.

It comprised mainly the modern Arabic Mashriq (Syria, Lebanon, Iraq, Israel, the Palestinian Territories and Jordan) except for the desert hinterland:

Further it contained the southeastern coast of Asia Minor and the close island of Cyprus

Diocese of Aegyptus

This diocese, comprising northeastern Africa—mainly Egypt, the rich granary and traditional personal domain of the emperors—was the only diocese that was not under a vicarius, but whose head retained the unique title of Praefectus Augustalis. It was created by a split of the Diocese of Oriens.

All but one, the civilian governors were of the modest rank of Praeses provinciae.

Aegyptus (in a narrow sense) came to designate Lower Egypt around Alexandria. Originally it was named Aegyptus Iovia (from Jupiter, for the Augustus Diocletian). Later it was divided into two provinces.
Augustamnica was the remainder of Lower Egypt, together with the eastern part of the Nile delta (13 'cities') – the only Egyptian province under a Corrector, a lower ranking governor. Originally it was named Aegyptus Herculia (for Diocletian's junior, the Caesar; with ancient Memphis). Later it was divided in two provinces
Thebais was Upper Egypt. Nubia south of Philae had been abandoned to tribal people. Later it was divided into two provinces, Superior and Inferior.
Arcadia (also Arcadia Ægypti; not to be confused with Arcadia in Greece)

Apart from modern Egypt, Aegyptus also comprised the former province of Cyrenaica, being the east of modern Libya (an ancient name for the whole African continent as well). Cyrenaica was split into two provinces, each under a praeses: