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Praetorian prefecture of the East
Praefectura praetorio Orientis
Ἐπαρχότης τῶν πραιτωρίων τῆς ἀνατολῆς
"Praet. Prefecture of the "East Roman Empire
337–7th century
""Location of Prefecture of Oriens
Praetorian Prefectures of the Roman Empire (395). The Praetorian Prefecture of the East is in grey.
Capital "Constantinople
Historical era "Late Antiquity
 •  Established 337
 •  reorganization into "themata 7th century
Political subdivisions "Diocese of Thrace
"Diocese of Asia
"Diocese of Pontus
"Diocese of the East
"Diocese of Egypt

The praetorian prefecture of the East or of Oriens ("Latin: praefectura praetorio Orientis, "Greek: ἐπαρχότης/ὑπαρχία τῶν πραιτωρίων τῆς ἀνατολῆς) was one of four large "praetorian prefectures into which the "Late "Roman Empire was divided. As it comprised the larger part of the "Eastern Roman Empire, and its seat was at "Constantinople, the praetorian prefect was the second most powerful man in the East, after the Emperor, in essence serving as his first minister.



The Prefecture was established after the death of "Constantine the Great in 337, when the empire was split up among his sons and "Constantius II received the rule of the East, with a "praetorian prefect as his chief aide. The part allotted to Constantius encompassed four (later five) "dioceses, each in turn comprising several "provinces. The authority of the prefecture stretched from the Eastern "Balkans, grouped into the "Diocese of Thrace, to "Asia Minor, divided into the dioceses of "Asiana and "Pontus, and the Middle East, with the dioceses of "Oriens and "Egypt.

List of known praefecti praetorio Orientis[edit]


  1. ^ Alan Cameron states that the first term of Aurelianus lasted until April 400
  2. ^ Cameron's dates for Aurelianus overlap those of Eutychianus in 400


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