| Diocese of Pannonia Dioecesis Pannoniarum | |
|---|---|
| Diocese of theRoman Empire | |
| 314-440s | |
 | |
| Capital | Sirmium |
| Area | |
| • Coordinates | 44°59′N19°37′E / 44.983°N 19.617°E /44.983; 19.617 |
| Historical era | Late Antiquity |
• Established | 314 |
• conquest by theHuns | 440s |
TheDiocese of Pannonia (Latin:Dioecesis Pannoniarum,lit. 'Diocese of the Pannonias'), from 395 known as theDiocese of Illyricum, was adiocese of theLate Roman Empire. The seat of thevicarius (governor of the diocese) wasSirmium.
It was originally part of thepraetorian prefecture of Italy and was incorporated by thepraetorian prefecture of Illyricum when it was established in 347.
Disputed by the two halves of the Empire in the following years, the Diocese of Pannonia was one of the two dioceses in the eastern quarters of theTetrarchy not belonging to the cultural Greek half of the empire (the other wasDacia), and so it was transferred back to the Western Empire at the death ofTheodosius I in 395 and was joined to the Prefecture of Italy as theDiocese of Illyricum.
In 425Galla Placidia gave the diocese of Illyricum to Eastern EmperorTheodosius II.
Its ultimate fate is uncertain. Pannonia was lost to theHuns in the 440s, although Dalmatia was retained by the Western Empire until c. 480.
TheOstrogoth king of ItalyTheodoric the Great conquered Pannonia in the late 5th century, possibly reestablishing the diocese.
The Diocese of Pannonia (Diocese of Illyricum occidentalis) included theRoman provinces ofPannonia Prima,Pannonia Valeria,Pannonia Savia,Pannonia Secunda,Noricum Mediterraneum,Noricum Ripensis andDalmatia.
Also under its jurisdiction were theExarch ofSirmium, theMetropolis ofLauriacum,Vindomana,Sirmium,Salona,Salisburgium and the "locus incertus" (the "unknown location", see:Miholjanec).
In the 9th century,Diocese of Pannonia was also a name of the ecclesiastical territory of theChristian church whose archbishop wasSaint Methodius.[1]