Diocese of Gaul - History

History

The diocese was established after the reforms of Diocletian and Constantine I in c. 314. In the early 5th century, the Rhine frontier was breached, and much of Gaul lost to barbarian tribes. The only territory remaining in Roman hands after the 450s was in the northwest, the so-called "Domain of Soissons". After its fall to the Franks in 486 and the end of Roman administration in northern Gaul, the diocese can be said to have de facto ended.

Late Roman Provinces (4th–7th centuries CE)
History
Provincial administration reformed and dioceses established by Diocletian, c. 293. Permanent praetorian prefectures established after the death of Constantine I. Empire permanently partitioned after 395. Exarchates of Ravenna and Africa established after 584. After massive territorial losses in the 7th century, the remaining provinces were superseded by the theme system in c. 640–660, although in Asia Minor and parts of Greece they survived under the themes until the early 9th century.
Western Empire (395–476)
Praetorian Prefecture
of Gaul
Diocese of Gaul
  • Alpes Poeninae et Graiae
  • Belgica I
  • Belgica II
  • Germania I
  • Germania II
  • Lugdunensis I
  • Lugdunensis II
  • Lugdunensis III
  • Lugdunensis IV
  • Maxima Sequanorum
Diocese of Vienne
  • Alpes Maritimae
  • Aquitanica I
  • Aquitanica II
  • Narbonensis I
  • Narbonensis II
  • Novempopulania
  • Viennensis
Diocese of Spain
  • Baetica
  • Balearica
  • Carthaginensis
  • Gallaecia
  • Lusitania
  • Mauretania Tingitana
  • Tarraconensis
Diocese of Britain
  • Britannia I
  • Britannia II
  • Flavia Caesariensis
  • Maxima Caesariensis
  • Valentia (369)
Praetorian Prefecture
of Italy
Diocese of Suburbicarian Italy
  • Apulia et Calabria
  • Bruttia et Lucania
  • Campania
  • Corsica
  • Picenum Suburbicarium
  • Samnium
  • Sardinia
  • Sicilia
  • Tuscia et Umbria
  • Valeria
Diocese of Annonarian Italy
  • Alpes Cottiae
  • Flaminia et Picenum Annonarium
  • Liguria et Aemilia
  • Raetia I
  • Raetia II
  • Venetia et Istria
Diocese of Africa
  • Africa proconsularis (Zeugitana)
  • Byzacena
  • Mauretania Caesariensis
  • Mauretania Sitifensis
  • Numidia Cirtensis
  • Numidia Militiana
  • Tripolitania
Diocese of Pannonia
  • Dalmatia
  • Noricum mediterraneum
  • Noricum ripense
  • Pannonia I
  • Pannonia II
  • Savia
  • Valeria ripensis
Eastern Empire (395–c.640)
Praetorian Prefecture
of Illyricum
Diocese of Dacia
  • Dacia Mediterranea
  • Dacia Ripensis
  • Dardania
  • Moesia I
  • Praevalitana
Diocese of Macedonia
  • Achaea
  • Creta
  • Epirus nova
  • Epirus vetus
  • Macedonia I
  • Macedonia II Salutaris
  • Thessalia
Praetorian Prefecture
of the East
Diocese of Thrace
  • Europa
  • Haemimontus
  • Moesia II
  • Rhodope
  • Scythia
  • Thracia
Diocese of Asia
  • Asia
  • Caria
  • Hellespontus
  • Insulae
  • Lycaonia (370)
  • Lycia
  • Lydia
  • Pamphylia
  • Pisidia
  • Phrygia Pacatiana
  • Phrygia Salutaria
Diocese of Pontus
  • Armenia I
  • Armenia II
  • Armenia Maior
  • Armenian Satrapies
  • Armenia III (536)
  • Armenia IV (536)
  • Bithynia
  • Cappadocia I
  • Cappadocia II
  • Galatia I
  • Galatia II Salutaris
  • Helenopontus
  • Honorias
  • Paphlagonia
  • Pontus Polemoniacus
Diocese of the East
  • Arabia
  • Cilicia I
  • Cilicia II
  • Cyprus
  • Euphratensis
  • Isauria
  • Mesopotamia
  • Osroene
  • Palaestina I
  • Palaestina II
  • Palaestina III Salutaris
  • Phoenice
  • Phoenice Libanensis
  • Syria I
  • Syria II Salutaris
  • Theodorias (528)
Diocese of Egypt
  • Aegyptus I
  • Aegyptus II
  • Arcadia
  • Augustamnica I
  • Augustamnica II
  • Libya Superior
  • Libya Inferior
  • Thebais Superior
  • Thebais Inferior
Other territories
  • Taurica
  • Quaestura exercitus (536)
  • Spania (552)
  • Later the Septem Provinciae.
  • Re-established after reconquest by the Eastern Empire in 534 as the separate Prefecture of Africa
  • Later the Diocese of Illyricum.
  • Joined the Quaestura exercitus in 536.
  • Affected (i.e. boundaries modified, abolished or renamed) by Justinian I's administrative reorganization in 534–536.

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