Theme, Greek Thema, in the Byzantine Empire, originally, a military unit stationed in a provincial area; in the 7th century the name was applied to large military districts or provinces formed as buffer territories against Muslim encroachments in Anatolia.
Provinces (Themes) of the Byzantine Empire – 1025 AD

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Markus Milligan - Markus is a journalist and the Managing Editor at HeritageDaily. His background is in archaeology and computer science, having written over 7,000 articles across several online publications. Markus is a member of the Association of British Science Writers (ABSW).