The term "Eastern Roman Emperors" refers to the rulers of the Byzantine Empire, which emerged after the division of the Roman Empire in the late 4th century. The Eastern Roman Empire, centered in Constantinople, continued to thrive for nearly a thousand years after the fall of the Western Roman Empire in 476 AD. These emperors were known for their administrative reforms, military campaigns, and cultural achievements. Notable emperors include Justinian I, who sought to reconquer lost territories and codified Roman law, and Constantine the Great, who established Constantinople as the new capital and promoted Christianity.