Civil Administrative Government of the Late Roman Empire

At the end of the Fourth Century, the Roman Empire was divided into 4 units (Prefectures) for the purposes of the civil government.

Source: History of the Later Roman Empire, by J.B. Bury.

I. Prefecture of the Gauls: (Britain, Gaul, Spain, and northwestern corner of Africa)

Dioceses (Governors):

• A. Britain
• B. Gaul
• C. Viennensis (Southern Gaul)
• D. Spain

II. Prefecture of Italy: (Africa, Italy, provinces between the Alps and the Danube, and the northwestern portion of the Illyrian peninsula)

Dioceses (Governors):

• A. Africa
• B. The Italies
  • Vicarius urbis Romae
  • Vicarius Italiae
• C. Illyricum

III. Prefecture of Illyricum: (Dacia, Macedonia, Greece)

Dioceses (Governors)

• A. Dacia
• B. Macedonia

IV. Prefecture of the East or Oriens: (from Thrace in the north to Egypt in the south and the territory of Asia)

Dioceses (Governors):

• A. Thrace
• B. Asiana
• C. Pontus
• D. Oriens
• E. Egypt