
1) Ancient Roman title
Found on
https://www.crosswordclues.com/clue/praefectus-urbi

The praefectus urbanus or praefectus urbi, in English the urban prefect, was prefect of the city of Rome, and later also of Constantinople. The office originated under the Roman kings, continued during the Republic and Empire, and held high importance in late Antiquity. The office survived the collapse of the Western Roman Empire, and the last urb...
Found on
http://en.wikipedia.org/wiki/Praefectus_urbi

(from the article `prefect`) In the early republic, a prefect of the city (praefectus urbi) was appointed by the consuls to act in the consuls` absence from Rome. The position ...
Found on
http://www.britannica.com/eb/a-z/p/104

prefect of the City This was a consular post, 'the highest dignity of the senate' (Dio lxxix.14.2), who was in command of the City of Rome whenever the two consuls were not present. His jurisdiction extended to the countryside surrounding Rome for a distance of one hundred miles. The appointment of Adventus to the position by emperor Macrinus in 21...
Found on
https://www.encyclo.co.uk/local/20768
No exact match found.