Diocese of Thrace

Diocese of the Roman Empire

Dioecesis Thraciae
Διοίκησις Θρᾴκης

Diocese of the Roman Empire314–535

The Diocese of Thrace c. 400.CapitalPhilippopolisHistorical eraLate Antiquity

• Established

314

• Diocese abolished by emperor Justinian I

535 Today part of

Bulgaria

Greece

Turkey

Romania

The Diocese of Thrace (Latin: Dioecesis Thraciae, Greek: Διοίκησις Θρᾴκης) was a diocese of the later Roman Empire, incorporating the provinces of the eastern Balkan Peninsula (comprising territories in modern south-eastern Romania, central and eastern Bulgaria, and Greek and Turkish Thrace). Philippopolis (modern Plovdiv, in Bulgaria) was the capital.

The diocese was established as part of the reforms of Diocletian and Constantine the Great, and was headed by a vicarius subordinate to the praetorian prefecture of the East. As outlined in the Notitia Dignitatum of c. 400, the diocese included the provinces of Europa, Thracia, Haemimontus, Rhodope, Moesia II and Scythia Minor.

In May 535, with Novel 26, Justinian I abolished the Diocese of Thrace. Its vicarius retained his rank of vir spectabilis and received the new title of praetor Justinianus, uniting in his hand both civil and military authority over the provinces of the former diocese, in a crucial departure from the strict separation of authority from the Diocletianian system. A year later, in May 536, the two Danubian provinces, Moesia Inferior and Scythia, where detached to form, along with other provinces, the quaestura exercitus.^[1]

List of known Vicarii Thraciarum

Aelius Claudius Dulcitius (?–361)
Capitolinus (361–363)
Andronicus (c. 366)
Philoxenus (c. 392)
Solomon (?–582)

References

^ Bury (1923) Vol. II, pp. 340–341

Sources

Bury, John Bagnell (1923). History of the Later Roman Empire: From the Death of Theodosius I to the Death of Justinian. London: MacMillan & Co. ISBN 0-486-20399-9.

Late Roman and early Byzantine provinces (4th–7th centuries AD)

History
As found in the Notitia Dignitatum. 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 After massive territorial losses in the 7th century, the remaining provinces were superseded by the theme system in c. 640–660, although in Asia Minor and parts of Greece they survived under the themes until the early 9th century.

History

As found in the Notitia Dignitatum. 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 Roman 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 the Britains	Britannia I Britannia II Flavia Caesariensis Maxima Caesariensis Valentia (?)

Praetorian prefecture
of Italy

Diocese of Suburbicarian Italy	Apulia et Calabria Campania Corsica Lucania et Bruttii 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 Histria
Diocese of Africa²	Africa proconsularis (Zeugitana) Byzacena Mauretania Caesariensis Mauretania Sitifensis Numidia (divided as Cirtensis and Militiana during the Tetrarchy) Tripolitania (Roman province)

Eastern Roman Empire (395–c. 640)

Praetorian prefecture
of Illyricum

Diocese of Pannonia³	Dalmatia Noricum mediterraneum Noricum ripense Pannonia I Pannonia II Savia Valeria ripensis
Diocese of Dacia	Dacia Mediterranea Dacia Ripensis Dardania Moesia I Praevalitana
Diocese of Macedonia	Achaea Creta Epirus Nova Epirus Vetus Macedonia Prima Macedonia II Salutaris Thessalia

Praetorian prefecture
of the East

Diocese of Thrace⁵	Europa Haemimontus Moesia II⁴ Rhodope Scythia⁴ Thracia
Diocese of Asia⁵	Asia Caria⁴ Hellespontus Islands⁴ Lycaonia (370) Lycia Lydia Pamphylia Pisidia Phrygia Pacatiana Phrygia Salutaris
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 East⁵	Arabia Cilicia I Cilicia II Cyprus⁴ Euphratensis Isauria Mesopotamia Osroene Palaestina I Palaestina II Palaestina III Salutaris Phoenice I Phoenice II Libanensis Syria I Syria II Salutaris Theodorias (528)
Diocese of Egypt⁵	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 Placed under the Quaestura exercitus in 536
⁵ Affected (i.e. boundaries modified, abolished or renamed) by Justinian I's administrative reorganization in 534–536