The Two Kingdoms treats a major achievement of the Carolingian "Renaissance," Frankish ecclesiology, and the influence of 9th-century ecclesiology upon contemporary political thought. Dr. Morrison focuses particularly on the argument that, in this world, government was divided between the earthly kingdom and the kingdom of the Church. Originally published in 1964. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.