In 324 CE, the Emperor Constantine I moved the capital of the Roman Empire to and renamed it Constantinople. The capital city of the Byzantine Empire, Constantinople, was located on the , which connects the Black Sea and the Mediterranean Sea. Emperor was known for codifying 900 years of Roman law into a single legal system, overseeing the building of the Hagia Sophia, and leading the territorial growth of the Byzantine Empire in the sixth century CE. Because of ongoing threats to the Byzantine Empire in the seventh century CE, Emperor Heraclius restructured the military into the system to prevent corruption. During , Constantinople was taken over by western forces, and the Byzantine Empire wasn't able to reclaim the city until 1261. During the Iconoclast Controversy, thought that images should be allowed in worship as long as they were used only as a guide. Historians see the as beginning at the end of the Iconoclast Controversy in the ninth century CE, while the East-West Schism marks the separation for religious authorities. Because the emperor in the Byzantine Empire held complete authority in all religious and civil matters, the empire was said to follow the principle of . Respond to the following based on your reading. Even though the Byzantine Empire faced ongoing invasions throughout its history, the empire survived for around 1,000 years. Explain the most significant factors that contributed to its long survival. Describe the major accomplishments of the emperors Constantine I, Theodosius I, and Heraclius I. Then evaluate which ones contributed the most to the empire, whether in the areas of culture, economy, the military, politics, and so on.