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Content: Among these leaders were Nerva, Trajan, Hadrian, Antoninus Pius, and Marcus Aurelius. Collectively, they are known as the Five Good Emperors and they expanded Rome’s frontierto the height of its expansion, controlling territoryfrom Britain all the way to parts of Mesopotamia. However, the size of the empire made it difficult to control from Rome alone. The emperor Diocletian decided to divide it into western and eastern halves in A.D. 285 to make managing the empire easier. Competition between the leaders of the halves emerged and resulted in civil war, which ultimately led the general Constantine to unify the empire under his own rule. He decided to move the imperial capital from Rome to the site of the ancient city of Byzantium, renaming the city Constantinople, and developing it further in the Roman style. Once Constantine moved the capital, Rome transitioned to a period of decline. War, a weakened treasury, and deterioration of infrastructureled to the loss of territory in the western half of the empire. The Western Empire finally collapsed in A.D. 476 while the Eastern Empire continued on as the Byzantine Empire until the city fell in A.D. 1453. This is a bronze statue of Caesar Augustus in the Via del Fori Imperiali, Rome, Lazio, Italy.