In the late Roman Empire and early Byzantine Empire, an "exarch" was a governor of a particular territory. From the end of the 3rd century or early 4th, every Roman diocese was governed by a vicarius, who was titled "exarch" in eastern parts of the Empire, where the Greek language and the use of Greek terminology dominated, even though Latin was the language of the imperial administration from the provincial level up until the 440s (Greek translations were sent out with the official Latin text). In Greek texts, the Latin title is spelled βικάριος (). The office of exarch as a governor with extended political and military authority was later created in the Byzantine Empire, with jurisdiction over a particular territory, usually a frontier region at some distance from the capital Constantinople.