| Diocese of Macedonia Dioecesis Macedoniae Διοίκησις Μακεδονίας | |
|---|---|
| Diocese of theRoman Empire | |
| 306–7th century | |
 | |
| Capital | Thessalonica |
| Historical era | Late Antiquity |
• Reforms of Diocletian | 306 |
• Thessalonica became the Prefecture's new capital city | 379 |
| 7th century | |
| Today part of |  Albania Greece North Macedonia Bulgaria |
TheDiocese of Macedonia (Latin:Dioecesis Macedoniae;Greek:Διοίκησις Μακεδονίας) was adiocese of the laterRoman Empire, forming part of thepraetorian prefecture of Illyricum. Its administrative centre wasThessalonica.
The diocese was formed, probably underConstantine I (r. 306–337), from the division of theDiocletianicDiocese of Moesia. It included the provinces ofMacedonia Prima,Macedonia Salutaris,Thessalia,Epirus vetus,Epirus nova,Achaea, andCrete. AlongsideDacia and, until 379,Pannonia, it made up thePrefecture of Illyricum. In 379, Pannonia was detached and merged into thePraetorian prefecture of Italy and Thessaloniki became the Prefecture's new capital city instead ofSirmium.
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