The document compares the Roman Empire and the Byzantine Empire in three sentences:
The Byzantine Empire was the eastern half of the Roman Empire that continued after the western half fell into the Dark Ages, with its capital at Constantinople instead of Rome and Greek as the dominant language rather than Latin. While similar in being based on Roman laws and culture, the Byzantine Empire differed in following Eastern Orthodox Christianity and lasted over 1000 years until 1453. The Byzantine Empire played an important role in preserving classical Greek and Roman knowledge and influenced neighboring civilizations like Kievan Rus through religion, trade, and cultural diffusion.