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Walter Ullmann

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A Short History of the Papacy in the Middle Ages
Growth of Papal Government in the Middle Ages
Medieval Papalism
Medieval Idea of Law as Represented by Lucas de Penna
Principles of Government and Politics in the Middle Ages (Routledge Revivals)
Carolingian Renaissance and the Idea of Kingship
The Origins of the Great Schism: A Study in Fourteenth-Century Ecclesiastical History
Authority and Power
The United States in Prague 1945-1948
Medieval Papalism: The Political Theories of the Medieval Canonists (Maitland Memorial Lectures, 1948.)
Medieval political thought
Principles of government and politics in the Middle Ages
The origins of the great schism: a study in fourteenth-century ecclesiastical history.
Law and politics in the Middle Ages: an introduction to the sources of medieval political ideas
The Carolingian Renaissance and the idea of kingship.

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