Exarch
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An exarch is an official in various jurisdictions both historical and modern.
Georgian Exarchate in the 19th century
Metropolitan Platon (Rozhdestvensky), last Exarch of Georgia (1915–1917) and first Exarch of Caucasus (1917–1918)
Gesupietrochiave
Roman diocese
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In the Late Roman Empire, usually dated AD 284 to 641, the regional governance district known as the Roman or civil diocese was made up of a grouping of provinces each headed by a vicarius, the vicars
Exarch
…and modern. In the late Roman Empire and early Byzantine Empire, an exarch was a regional governor. From the end of the 3rd or early 4th century, every Roman imperial diocese was headed by a civilian governor titled as vicar (Latin: vicarius), who was also called "exarch" in eastern parts of the Empire, where the Greek…
Emperor Constantine.