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 PREFACE Dean Milman's History of Latin Christianity, published by the same firm, I have found of very little use; it is too concentrated.

Messrs. Macmillan & Co. have brought out valuable books on the subject. Lanciani's four earlier volumes, Pagan and Christian Rome, Ancient Rome, the Destruction of Ancient Rome, and Ruins and Excavations of Ancient Rome, all of them published by this firm, are never off my writing-table. Macmillan's Handbook to Italy and Sicily has a special value because in it the towns are arranged alphabetically in gazetteer fashion. Other books of this firm to which I have occasionally to refer are Mr. Walter Lowrie's Christian Art and Archaeology, Professor Bryce's phenomenal book, The Holy Roman Empire, and those delightful books, Mrs. Oliphant's Makers of Modern Rome, and Mr. Marion Crawford's Ave Roma Immortalis. The essay entitled A Survey of the Thirteenth Century, in Mr. Frederic Harrison's volume of essays, The Meaning of History, which I keep on a shelf beside my volumes of John Addington Symonds, I have found very suggestive.

There are few publishers to whom I am more indebted in the preparation of this work than Messrs. A. & C. Black, who publish the admirable Handbook to Christian and Ecclesiastical Rome, by Misses Tuker and Malleson, which I have used Rh