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Byzacena was a Roman province in what is now Tunisia.

At the end of the third century AD, the Emperor Diocletian divided the great Roman province of Africa Proconsularis into three smaller provinces: Zeugitana in the north, still governed by a proconsul and referred to as Proconsularis, Byzacena, and Tripolitania in the south. It corresponded roughly to the modern Tunisian region of Sahel.

Hadrumetum (modern Sousse) became the capital of the newly-made province, whose governor had the rank of consularis. At this period the metropolis of Byzacena was, after Carthage, the most important town in Roman Africa.

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 After massive territorial losses in the 7th century, the remaining provinces were superseded by the theme system in c. 640–660, although in Asia Minor and parts of Greece they survived under the themes until the early 9th century.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 Vienne¹	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 Africa²	Africa proconsularis (Zeugitana) Byzacena Mauretania Caesariensis Mauretania Sitifensis Numidia Cirtensis Numidia Militiana Tripolitania

Diocese of Pannonia³	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 II⁴ Rhodope Scythia⁴ Thracia

Diocese of Asia⁵	Asia Caria⁴ Hellespontus Insulae⁴ Lycaonia (370) Lycia Lydia Pamphylia Pisidia Phrygia Pacatiana Phrygia Salutaria

Diocese of Pontus⁵	Armenia I⁵ Armenia II⁵ Armenia Maior⁵ Armenian Satrapies⁵ Armenia III (536) Armenia IV (536) Bithynia Cappadocia I⁵ Cappadocia II⁵ Galatia I⁵ Galatia II Salutaris⁵ Helenopontus⁵ Honorias⁵ Paphlagonia⁵ Pontus Polemoniacus⁵

Diocese of the East	Arabia Cilicia I Cilicia II Cyprus⁴ 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)

¹ Later the Septem Provinciae.
² Re-established after reconquest by the Eastern Empire in 534 as the separate Prefecture of Africa
³ Later the Diocese of Illyricum.
⁴ Joined the Quaestura exercitus in 536.
⁵ Affected (i.e. boundaries modified, abolished or renamed) by Justinian I's administrative reorganization in 534–536.

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