Roman province

In Ancient Rome, a province (Latin, provincia, pl. provinciae) was the basic and, until around 300, largest territorial and administrative unit of the empire's territorial possessions outside of the peninsula of Italy. The word province in modern English came from the term used by the Romans.

References
 Early Imperial Roman provinces, at livius.org 

 Chris Scarre, "The Eastern Provinces," The Penguin Historical Atlas of Ancient Rome (London: Penguin Books, 1995), 74-75.

Other websites

 Map of the Roman Empire 
 Map of the Roman Empire in year 300

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