5.

 What problems of language made unity between Rome and Constantinople more difficult?

            By the year 450, very few people in Western Europe could read Greek, the language of the Byzantines. Similarly, after 600, very few Byzantines could read Latin, the language of the Romans (even though Byzantium still referred to itself as the Roman Empire). If Latins and Greeks wanted to read each other's works, they could do so only in translation, although usually they did not do even that. Consequently, with their no longer drawing upon the same sources or reading the same books, East and West drifted further apart.