- Diocese of Dacia
The Diocese of Dacia (Latin: Dioecesis Daciae) was a diocese of the later Roman Empire, in the area of modern Serbia and western Bulgaria. It was subordinate to the Praetorian prefecture of Illyricum. Its capital was at Serdica (modern Sofia).
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. ”
Later, during the administrative reforms of Diocletian and Constantine I, 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, Moesia Superior, Dardania, Praevalitana and Dacia Ripensis.
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, the Praetorian prefecture of Illyricum.
Late Roman Provinces (4th–7th centuries) HistoryProvincial 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 After massive territorial losses in the 7th century, the remaining provinces were superseded by the theme system in c. 640–660, although in Asia Minor and parts of Greece they survived under the latter until the early 9th century.Western Empire (395–476) Praetorian
Prefecture of GaulDiocese 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 (later Septem Provinciae): 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)
Prefecture of ItalyDiocese 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 (later of Illyricum): Dalmatia • Noricum mediterraneum • Noricum ripense • Pannonia I • Pannonia II • Savia • Valeria ripensisEastern Empire (395–ca. 640)
Prefecture of Illyricum
Prefecture of the EastDiocese 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
- affected (boundaries modified/abolished/renamed) by Justinian I's administrative reorganization in 534–536 † re-established after reconquest by the Eastern Empire in 534, as the separate prefecture of Africa § joined together into the Quaestura exercitus in 536
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