Diocese of Macedonia

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Diocese of Macedonia
Dioecesis Macedoniae
Διοίκησις Μακεδονίας
Diocese of the Roman Empire
306-7th century
Location of Macedonia
Capital Thessaloniki
Historical era Late Antiquity
 -  Reforms of Diocletian 306
 -  Thessaloniki became the Prefecture's new capital city 379
 -  Slavic invasion of the Balkans 7th century
Today part of  Albania
 Greece
 Macedonia

The Diocese of Macedonia (Latin: Dioecesis Macedoniae, Greek: Διοίκησις Μακεδονίας) was a diocese of the later Roman Empire, forming part of the praetorian prefecture of Illyricum. Its administrative centre was Thessaloniki.

The diocese was formed, probably under Constantine I (r. 306–337), from the division of the Diocletianian Diocese of Moesia. It included the provinces of Macedonia Prima, Macedonia Secunda or Salutaris (periodically abolished), Thessalia, Epirus vetus, Epirus nova, Achaea, and Crete. Alongside Dacia and, up until 379, Pannonia, it made up the Prefecture of Illyricum. In 379, Pannonia was detached and merged into the Praetorian prefecture of Italy and Thessaloniki became the Prefecture's new capital city instead of Sirmium.

The region was overrun during the Slavic invasion of the Balkans in the 7th century.

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