Roman diocese
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In the Late Roman Empire, usually dated AD 284 to 641, the regional governance district known as the Roman or civil diocese was made up of a grouping of provinces each headed by a vicarius, the vicars
Emperor Constantine.
Praetorian prefecture
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The praetorian prefecture was the largest administrative division of the late Roman Empire, above the mid-level dioceses and the low-level provinces. Praetorian prefectures originated in the reign of
Roman diocese
…Roman Empire. The principal territorial reform undertaken by Constantine, as part of a process of trial-and-error, was the 'regionalisation' of the Praetorian prefecture. Hitherto, one or two Praetorian prefects had served as chief minister for the whole empire, with military, judicial, and fiscal responsibilities. The…
The insignia of the praetorian prefect of Illyricum, as depicted in the Notitia Dignitatum: the ivory inkwell and pen case (theca), the codicil of appointment to the office on a blue cloth-covered table, and the state carriage.