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The Diocese of Moesia (Latin: Dioecesis Moesiarum, Greek: Διοίκησις Μοισιών) was one of the twelve dioceses in which Diocletian (r. 284–305) divided the Roman Empire during his administrative reforms. It encompassed most of the central Balkans and the Greek peninsula, stretching from the Danube to Crete. The diocese was split in two, forming the Diocese of Macedonia in the south and the Diocese of Dacia in the north, probably under Constantine I (r. 306–337), although it is not attested until ca. 370. The two new diocese were grouped into the new praetorian prefecture of Illyricum in the second half of the 4th century, which essentially covered the same area as the Diocese of Moesia.[1]
At the time of Diocletian, the diocese comprised 11 provinces:[2][3]