The new dioceses and provinces under Diocletian
Diocese of the East (Dioecesis Orientis)
Libya Superior
Libya Inferior
Thebais
Iobia Egypt (ca. 314-315)
Herculia Egypt (ca. 314-315)
New Arabia
Arabia
Augustia of Lebanon
Palestine
Phoenice
Coele-Syria
Augusta Euphratensis
Cilicia
Cyprus
Mesopotamia
Osroene
Diocese of Pontus (Dioecesis Pontica)
Bithynia
Cappadocia
Galatia
Paphlagonia
Diospontus
Pontus Polemoniacus
Armenia
Diocese of Asia (Dioecesis Asiana)
Lycia and Pamphylia
Phrygia I
Phrygia II
Asia
Lydia
Caria
Pisidia
Hellespont
Diocese of Thrace (Dioecesis Thraciae)
Europe
Rhodope
Thrace
Haemimontus
Scythia
Diocese of Moesia
Dacia
Dacia Paraktia
Moesia Superior
Dardania
Macedonia
Thessaly
Achaea
Probitalina
New Epirus
Diocese of Panonia
Pannonia Superior
Pannonia Inferior
Sabike
Dalmatia
Baleria
Noricum Ripensis
Noricum Mediterraneum
Diocese of Italy
Venice and Istria
Emilia and Ligouria
Flaminia and Picenum
Tuscia and Umbria
Campania
Apulia and Calabria
Lucania and Brutio
Sicily
Sardinia
Corsica
Alpes Cotiaies
Raitike
Diocese of France
Belgica I
Belgica II
Germania I
Germania II
Sequanorum
Gallia Lugdunensis I
Gallia Lugdunensis II
Alpes Poenninae et Graiae
Diocese of Vienna
Vienna
Narbonica I
Narbonica II
Novem Populi
Acquitaine I
Acquitaine II
Alpes
Diocese of Brittania
Brittania I
Brittania II
Caesaria Maxima
Caesaria Flavia
Diocese of Spain
Baetica
Loucitania
Carthagenia
Gallicia
Tarraconensis
Mauritania Tingitanis
Diocese of Africa
Africa proconsularis
Byzacena
Tripolitania
Numidia of Syrte
Numidia of Militiane
Mauretania Caesariensis
Mauretania Sitifensis