Book excerpt: In its various incarnations, the Roman Empire survived until 1918, when the last two rulers to bear the title "Caesar" (Kaiser Wilhelm in Germany and Tsar Nicholas II of Russia) fell from power. This volume contains the thinking of an international team of twelve scholars who analyze two of the most important changes in political and religious identity brought about by that empire: a change from the Greek kinship- and polis-based system to the territorial system of imperial Rome, and the development of a universal religious consciousness that lasted from the adoption of Christianity in the fourth century to the development of the nation-state in modern times.