Originally eparchy (ἐπαρχίᾱ, "eparchia") was the Greek equivalent of the Latin term "provincia", one of the districts of the Roman Empire. As such it was used, chiefly in the eastern parts of the Empire, to designate the Roman provinces. The term eparch (, "eparchos") however, designating an eparchy's governor, was most usually used to refer to the praetorian prefects (singular in Greek: , "eparch of the praetorium") in charge of the Empire's praetorian prefectures, and to the Eparch of Constantinople, the city's urban prefect.