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Praetorian prefecture of Illyricum

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Title: Praetorian prefecture of Illyricum  
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Subject: Diocese of Dacia, Sirmium, WikiProject Bosnia and Herzegovina/Watchlist, History of Vojvodina, Sremska Mitrovica
Collection: 4Th Century in the Byzantine Empire, 5Th Century in the Byzantine Empire, 6Th Century in the Byzantine Empire, 7Th Century in the Byzantine Empire, 7Th-Century Disestablishments, Ancient Croatia, Ancient History of Slovenia, Ancient History of Vojvodina, Ancient Hungary, Ancient Montenegro, Byzantine Serbia, History of Albania, History of Austria, History of Bosnia and Herzegovina, History of Bulgaria, History of Dalmatia, History of Syrmia, History of Vojvodina, Hungary Before the Magyars, Late Roman Thessalonica, Medieval Thessalonica, Praetorian Prefecture of Illyricum, Roman Bulgaria, Roman Dalmatia, Roman Greece, Roman Illyria, Roman Serbia, Roman-Era Republic of MacEdonia, States and Territories Established in 357
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Praetorian prefecture of Illyricum

Praetorian prefecture of Illyricum
Praefectura praetorio per Illyricum
Ἐπαρχότης Ἰλλυρικοῦ
Praet. prefecture of the East Roman Empire
347–7th century
Location of Prefecture of Illyricum
The praetorian prefecture of Illyricum (375-379)
Capital Sirmium, later Thessalonica
Historical era Late Antiquity
 •  Established 347
 •  loss of most of Illyricum to Slavic incursions 7th century
Political subdivisions Diocese of Macedonia
Diocese of Dacia
Diocese of Pannonia (until 379)

The praetorian prefecture of Illyricum (Latin: praefectura praetorio per Illyricum, Greek: ἐπαρχότης/ὑπαρχία [τῶν πραιτωρίων] τοῦ Ἰλλυρικοῦ, also termed simply the Prefecture of Illyricum) was one of four praetorian prefectures into which the Late Roman Empire was divided.

The administrative centre of the prefecture was Sirmium (375-379), and, after 379, Thessalonica.[1][2] It took its name from the older province of Illyricum, which in turn was named after ancient Illyria, and in its greatest expanse encompassed Pannonia, Noricum, Crete, and most of the Balkan peninsula except for Thrace.


  • Administrative history 1
  • List of known praefecti praetorio per Illyricum 2
  • References 3
  • Sources 4
  • External links 5

Administrative history

Unlike the other three "classical" prefectures that are mentioned in the Notitia Dignitatum (Gaul, Italy-Africa and the East), the early administrative history of Illyricum as a prefecture during the 4th century was a matter of it being abolished, re-established and divided several times.[3]

Initially the territories comprising the later prefecture belonged to the central Prefecture of Italy, Illyricum and Africa, when it was established in 337 following the division of the Empire among the sons of Constantine the Great. It seems that the three dioceses of Macedonia, Dacia and Pannonia were first grouped together in a separate praetorian prefecture in 347 by Constans from the prefecture of Italy and Africa.

It remained in existence until 361, when it was abolished by emperor Julian, and then existed again from 375-379 under Gratian.[4] In that year the Diocese of Pannonia (Illyricum occidentale, "Western Illyricum") was again added to Italy as the "Diocese of Illyricum", while Macedonia and Dacia (Illyricum orientale, "Eastern Illyricum") were ruled briefly directly by Theodosius I from Thessalonica.[5] During the years (384-395) they too were incorporated in the Italian prefecture, except a short period in 388-391, when the two dioceses formed a separate prefecture.[4]

Praetorian Prefectures of the Roman Empire (375-379)

Only after the death of Theodosius in 395 and the permanent division of the Empire did the Illyricum assume the permanent form which appears in the Notitia, incorporating the dioceses of Macedonia and Dacia, with Thessalonica as capital. However, the Western Empire, especially during the regency of Stilicho, continued to lay claim to them until 437, when, as part of the dowry of Licinia Eudoxia, Valentinian III recognized the East's sovereignty over the prefecture.[6] On this occasion, it appears that the prefecture's capital was again moved for a while (437-441) to Sirmium,[7] but the move is debated, as the northern Balkans were at the time ravaged by invasions. Likewise, the intention of Justinian I to move the capital to his new city of Justiniana Prima in the 540s remained unfulfilled. [8]

Following the Slavic invasions in the 7th century, most of the Balkan hinterland was lost by the distinct theme under a strategos sometime before 840.[9]

List of known praefecti praetorio per Illyricum

Insignia of the Praetorian Prefect of the Illyricum


  1. ^ Thessalonica, 1910 Catholic Encyclopedia
  2. ^ Illyria, 1910 Catholic Encyclopedia
  3. ^ It is a common mistake that the praetorian prefectures were established as territorial units by Constantine I already around 318 or 324, as anachronistically claimed by Zosimus. In reality, each Augustus or Caesar continued to have his own praetorian prefect as his chief of staff, and only by the mid-4th century did the prefectures become permanent administrative subdivisions of the Empire. Morrison (2007), pp. 190–191
  4. ^ a b Morrison (2007), p. 396
  5. ^ Greece, 1910 Catholic Encyclopedia
  6. ^ Morrison (2007), pp. 397–398
  7. ^ Southern Pannonia during the age of the Great Migrations
  8. ^ Morrison (2007), pp. 401–402
  9. ^ Bury (1912), pp. 223–224


  • Notitia dignitatum
  • (Greek) Morrison, Cécile, ed. (2007), Le Monde Byzantin I - L'Empire romain d'orient (330-641) (in Greek), Athens: Polis Editions,  
  • * The Times History of Europe, Times Books, London, 2001.

External links

  • Map - The Roman Empire in 337
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