The Roman Empires capital was Rome their religion was Roman Catholic and they spoke Latin. They were located on the western half of the old Roman Empire and fell into the dark ages. 

Many things were traded from Byzantine and introduced to Russia such as:

Cyrillic alphabet    art work-mosaics

Religion  architecture

They preserved the knowledge, art, ideas, of the of roman and Greek cultures.The three big reasons why the empire lasted so long was because they had a highly organized government, they did not get to big, and minded their own business. 

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