Around 2,000 years ago, Rome was considered the center of the world, but the city began to decline after this Roman Emperor transferred his capital to Byzantium in 330 A.D. Who was he?

The Roman Empire experienced a monumental shift under the rule of Constantine the Great (Review). After emerging victorious from a series of civil wars in the early 4th century, he became the sole ruler of the empire. His reign is most famous for his conversion to and legalization of Christianity, which ended centuries of persecution and fundamentally altered the religious landscape of the Western world.

In 330 A.D., Constantine made a decision that would reshape the map for the next millennium. He relocated the imperial capital from Rome to the ancient Greek city of Byzantium. The site was strategically brilliant, located on a peninsula at the crossroads of Europe and Asia, making it easily defensible and perfect for controlling trade. Unlike Rome, with its deep-rooted pagan traditions and powerful aristocracy, the new city could be built from the ground up as a Christian capital.

Constantine lavishly rebuilt the city, renaming it Nova Roma (New Rome), though it almost immediately became known as Constantinople, the "City of Constantine." This move marked the beginning of the end for Rome's dominance, as the empire's political, cultural, and economic center of gravity shifted eastward. While the Western Roman Empire would collapse within a century and a half, the Eastern half, later known as the Byzantine Empire, would thrive for another thousand years with Constantinople as its magnificent heart.