The Byzantines were the inhabitants of the Byzantine Empire, which emerged from the eastern part of the Roman Empire after its division in the 4th century. Centered in the city of Constantinople, the empire was known for its rich culture, advanced administration, and strong military. The Byzantines preserved much of Roman law and Greek philosophy, influencing later European civilizations. The Byzantine Empire lasted for over a thousand years, until its fall in 1453. It played a crucial role in the spread of Christianity and was a center for trade and art. Byzantine architecture, particularly the Hagia Sophia, is renowned for its grandeur and innovation.