The present volume deals with a small but very important portion of the history of the world. Its object is to give as adequate an account as is possible in one volume of the chief changes in western Europe since the German barbarians overcame the armies of the Roman Empire and set up states of their own, out of which the present countries of France, Germany, Italy, Austria, Spain, the Netherlands, and England have slowly grown. There are, however, whole libraries upon the history of each of these countries during the last fifteen hundred years, and it requires a volume or two to give a tolerably complete account of any single important person, like St. Francis, Cromwell, Frederick the Great, or Napoleon. Besides biographies and general histories, there are many special treatises upon the Church and other great institutions; upon the literature, art, philosophy, and law of the various countries. It is obvious, therefore, that only a very few of the historical facts known to scholars can possibly find a place in a single volume such as this. One who undertakes to condense what we know of Europe's past, since the times of Theodosius and Alaric, into the space of six hundred pages assumes a very grave responsibility. The reader has a right to ask not only that what he finds in the book shall be at once true and clearly stated, but that it shall consist, on the whole, of the most important and useful of all the things which might have been selected from the well-nigh infinite mass of true things that are known. We gain practically nothing from the mere enumeration of events and dates. The student of history wishes to know how people lived; what were their institutions (which are really only the habits of nations), their occupations, interests, and achievements; how business was transacted in the Middle Ages almost without the aid of money; how, later, commerce increased and industry grew up; what a great part the Christian church played in society; how the monks lived and what they did for mankind. In short, the object of an introduction to mediæval and modern European history is the description of the most significant achievements of western civilization during the past fifteen hundred years,--the explanation of how the Roman Empire of the West and the wild and unknown districts inhabited by the German races have become the Europe of Gladstone and Bismarck, of Darwin and Pasteur. In order to present even an outline of the great changes during this long period, all that was exceptional and abnormal must be left out. We must fix our attention upon man's habitual conduct, upon those things that he kept on doing in essentially the same way for a century or so. Particular events are important in so far as they illustrate these permanent conditions and explain how the western world passed from one state to another. [Sidenote: We should study the past sympathetically.]