Central to the Byzantine Empire's identity was the birth and evolution of Orthodox Christianity. While Christianity had spread throughout the Roman Empire, it was in Byzantium that the Christian faith found its most lasting and transformative expression. The empire became the cradle for what we now know as Orthodox Christianity, defining the theological, liturgical, and doctrinal foundations that would shape the spiritual life of millions of people for centuries to come. The relationship between church and state in the Byzantine world was unique, with the emperor seen as God’s representative on Earth, tasked with protecting and preserving the Christian faith. This intertwining of political power and religious authority created a distinctive Christian empire that became a model for later Christian monarchies.
As the Roman Empire crumbled in the West, the Byzantine Empire emerged as the last vestige of ancient Roman civilization, carrying forward the intellectual traditions of antiquity while adapting to new realities. In its golden age, under emperors such as Justinian I, the empire expanded its borders and codified its laws, preserving the Roman legacy for future generations.