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Dioecesis Daciarum
Diocese of Dacia

Diocese of the Roman Empire

ca. 337 – 357

Dioceses in 400 AD

Historical era

Late Antiquity

Administrative reform

ca. 337

Merged into Praetorian prefecture of Illyricum

357

The Diocese of Dacia (Latin: Dioecesis Daciae) was a diocese of the later Roman Empire, in the area of modern Serbia, Montenegro and western Bulgaria. It was subordinate to the praetorian prefecture of Illyricum. Its capital was at Serdica (modern Sofia).

History [edit]

Emperor Aurelian (270-275), confronted with the secession of Gallia and Hispania from the empire since 260, with the advance of the Sassanids in Asia, and the devastations that the Carpians and the Goths had done into Moesia and Illyria, abandoned the province of Dacia created by Trajan and withdrew the troops altogether, fixing the Roman frontier at the Danube. A new Dacia Aureliana was organised south of the Danube our of central Moesia, with its capital at Serdica.

The abandonment of Dacia Traiana by the Romans is mentioned by Eutropius in his Breviarium historiae Romanae, book IX :

“

The province of Dacia, which Trajan had formed beyond the Danube, he gave up, despairing, after all Illyricum and Moesia had been depopulated, of being able to retain it. The Roman citizens, removed from the town and lands of Dacia, he settled in the interior of Moesia, calling that Dacia which now divides the two Moesiae, and which is on the right hand of the Danube as it runs to the sea, whereas Dacia was previously on the left.

”

Map of the northern Balkans in the 6th century, including the Diocese of Dacia and its provinces.

Later, during the administrative reforms of Diocletian and Constantine the Great, the Diocese of Moesia was created, encompassing most of the central Balkans and the Greek peninsula. After a few years, however, the diocese was split in two, forming the Diocese of Macedonia and the Diocese of Dacia, encompassing the provinces of Dacia Mediterranea (the southern, interior portion of Dacia Aureliana), Dacia Ripensis (the northern, Danubian portion of Dacia Aureliana), and Moesia Superior, Dardania and Praevalitana.

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. However, upon his death in 395, it reverted to the Eastern Empire, forming, together with the Diocese of Macedonia to the south, the praetorian prefecture of Illyricum.

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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