The word Byzantine has been derived from term Byzantium and this word is basically belongs to Greek man named Byzas. The whole Empire of Byzantine was Greek speaking and it was also in the continuation of eastern part of great Roman Empire during the period of late Middle East ages and late antiquity. The capital of this Empire was Constantinople that known in the modern age with the name of Istanbul. Byzantine also survived the fragmentation and it causes fall to the Western Roman Empire. During the period of 5th century AD this Empire was the most powerful in terms of culture, economics and in military force.
The Byzantine Empire became more powerful after the fall of the Roman Empire and it becomes that successor of Roman Empire that fell