“Saint Paul was proud of his Roman citizenship, and his letter to various Christian communities in the empire presupposed an effective communications system that only Roman government, law, and military might allowed."The Church's administration evolved as the imperial government's structured was modified over time. An archbishop ruled a large territory that the Romans called a province. A bishop ruled a diocese, a smaller Roman administrative unit dominated by a large city."The capitals of the eastern and western parts of the empire -- Constantinople and Rome -- came in time to signify unusual and superior power for the bishops resident there. When the Roman state was dissolved in the Latin-speaking world around 458 A.D., the pope replaced the emperor as the political leader of the Eternal City.”