Praefectus
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| Ordinary magistrates | 
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| Public law | 
| Senatus consultum ultimum | 
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Look up praefectus in Wiktionary, the free dictionary.
Praefectus, often with a further qualification, was the formal title of many, fairly low to high-ranking, military or civil officials in the Roman Empire, whose authority was not embodied in their person (as it was with elected Magistrates) but conferred by delegation from a higher authority. They did have some authority in their prefecture, such as controlling prisons and in civil administration.