Celebrated Austrian-Jewish scholar Walter Ullmann (1910-1983) was a leading authority in the field of medieval political thought, and in particular legal theory. He settled in the United Kingdom after leaving Austria in the late 1930s and went on to hold positions at the University of Leeds and Trinity College, Cambridge as Professor of Medieval History. Featured in this Routledge Revivals collection are the works: The Medieval Idea of Law as Represented by Lucas de Penna (1946), The Principles of Government and Politics in the Middle Ages (1961), The Individual and Society in the Middle Ages (1966) and The Carolingian Renaissance and the Idea of Kingship (1969).