Byzantine Commonwealth is a term coined by 20th century historians to refer to the area where Byzantine liturgical tradition was spread during the Middle Ages by Byzantine missionaries. This area covers approximately the modern-day countries of Bulgaria, the Republic of Macedonia, Montenegro, Russia, Serbia, Romania, Ukraine, Georgia, Moldova and Belarus. The most important treatment of the concept is a study by Dimitri Obolensky, The Byzantine Commonwealth (1971).
- Obolensky, Dimitri (1974), The Byzantine Commonwealth: Eastern Europe, 500-1453.
- Meyendorff, John (1982), The Byzantine Legacy in the Orthodox Church. St Vladimir's Seminary Press, ISBN 0913836907.
- Byzantine commonwealth at Wikipedia.