<italic>A History of Mediaeval Political Theory in the West</italic>. By Sir <sc>R. W. Carlyle</sc>, K.C.S.I., C.I.E., and <sc>A. J. Carlyle</sc>, M.A., D.Litt., Lecturer in Politics and Economics, University College, Oxford. Volume IV. <italic>The Theories of the Relation of the Empire and the Papacy from the Tenth Century to the Twelfth</italic>. By A. J. Carlyle. (Edinburgh and London: William Blackwood and Sons. 1922. Pp. xxiii, 419. 30s.))
The American Historical Review