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The Byzantine Commonwealth: Eastern Europe, 500–1438. By D. Obolensky. New York: Praeger, 1971. xiv + 445 pp. $15.

This book discusses the relations, political, diplomatic, economic, cultural and religious, between Byzantium and the eastern European peoples (especially Slavs but including Hungarians and others) between 500 and 1453. This entire pan­ orama is subsumed under the rubric of the Byzantine "Commonwealth", that is, the Empire, legally speaking, but including also other peoples so closely tied to Byzantium by a common Orthodox faith and culture and a certain allegiance to the Emperor (and definitely the Patriarch) as to constitute a supra-national Ortho­ dox "state" or "Commonwealth". Though not entirely new (note the Byzantine "Family of Princes" theory), this is the first time anyone has successfuly dealt with this theme on such a large scale.