| Notes |
Provincial administration reformed by Diocletian, ca. 293. Praetorian prefectures established after the death of Constantine I. Empire permanently partitioned after 395. Exarchates of Ravenna and Africa established after 584. After massive territorial loss due to the Muslim conquests, the remaining provinces were superseded by the theme system in ca. 640–660
* affected (boundaries modified/abolished/renamed) by Justinian's administrative reorganization in 534–536
† re-established after reconquest by the Eastern Empire in 534, as the separate praetorian prefecture of Africa
§ joined together into the Quaestura exercitus in 536 |