were ventures near at hand for which the Church could find volunteers without the slightest difficulty. But those which she was more particularly bent on forwarding were distant, hazardous, and irksome; the majority of the men who went on her great Crusades had no prospect of any temporal advantage. In the end those enterprises to which she gave her special countenance proved the least successful. It was not in the Eastern Mediterranean but in Spain, in Lower Italy, and in Central Europe, that the frontiers of Western Christendom were permanently advanced. For the historian, however, the failures have an interest not inferior to that of the more productive enterprises. The age of border wars and border colonies begins long before the appearance of a true crusading spirit. In German history the movement of expansion dates from Henry the Fowler; when he captured Brandeburg (928) and annexed the heathen tribes between the Elbe and Oder, he inaugurated a policy of settlement and colonisation which the German Margraves of those regions were to pursue, slowly and methodically for more than two hundred years. In its later stages the policy was sometimes assisted by Crusaders; from the first it made many converts to Christianity, and was furthered by the foundation of frontier sees and churches subject to the German archbishops of Hamburg and Magdeburg. But the men who directed the policy were purely secular and selfish. The greatest of them, Henry the Lion, Duke of Saxony from 1142 to 1180, and Albert the Bear, Margrave of Brandenburg from 1134 to 1170, concentrated their energies upon the development and extension of their principalities, exploited the Slavs, plotted against one another and their Christian neighbours, neglected national interests, and frankly made the Church the instrument of their ambitions. Yet in the craft of state-building they showed exceptional sagacity, enlisting as their allies the traders of the Baltic, the peasants of North Germany and the Low Countries. Under their rule and that of their most successful imitators, the Teutonic Knights in Prussia, cities such as Lubeck (founded 1143) and Dantsic (colonised 1308) became centres of German trade and culture; while the open country in the basins of the Elbe and Oder was covered with newly settled villages of German immigrants. The effects of this colonisation have extended far beyond the lands immediately affected and the limits of medieval history. The new colonies laid the foundations of modern Prussia and modern Saxony. To their existence is due the connection of Poland and Bohemia with the state system of medieval Europe, and the consequent division of the Slavonic peoples into a western and an eastern group; the westward expansion of the Russian Empire was forestalled and prevented by these early pioneers of German and of Roman influence. Only less important was the German advance along the Danube, from the river Inn to Vienna and the Hungarian frontier, which was