Praetorian prefect (Latin: praefectus praetorio, Greek: ἔπαρχος/ὕπαρχος τῶν πραιτωρίων) was the title of a high office in the Roman Empire. Originating as the commander of the Praetorian Guard, the office gradually acquired extensive legal and administrative functions, with its holders becoming the Emperor's chief aides. Under Constantine I, the office was much reduced in power and transformed into a purely civilian administrative post, while under his successors, territorially-defined praetorian prefectures emerged as the highest-level administrative division of the Empire. The prefects again functioned as the chief ministers of the state, with many laws addressed to them by name. In this role, praetorian prefects continued to be appointed until the reign of Heraclius, when wide-ranging reforms reduced its power and converted it to a mere overseer of provincial administration. The last traces of the prefect disappeared in the Byzantine Empire in the 840s.
The term praefectus praetorio was often abbreviated in inscriptions as 'PR PR' or 'PPO'.
Read more about Praetorian Prefect: List of Known Prefects of The Praetorian Guard
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“The State has but one face for me: that of the police. To my eyes, all of the State’s ministries have this single face, and I cannot imagine the ministry of culture other than as the police of culture, with its prefect and commissioners.”
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