which eastern empire had an unusually successful frontier state on the border of the christian world
The Byzantine Empire (or Byzantium) was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. [ Known simply as the "Roman Empire" (Greek: ?as??e?a ??µa???, Basileia Rhomaion) or Romania (??µa??a) to its inhabitants and neighbours, it was the direct continuation of the Ancient Roman State and maintained Roman state
traditions.Byzantium is today distinguished from ancient Rome proper insofar as it was oriented towards Greek culture, characterised by Christianity rather than Roman paganism and was predominantly Greek-speaking rather than Latin-speaking. ]
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