In the three preceding chapters the Holy Empire has been described in what is not only the most brilliant but the most momentous period of its history; the period of its rivalry with the Popedom for the chief place in Christendom. For it was mainly through their relations with the spiritual power, by their friendship and protection at first, no less than by their subsequent hostility, that the Teutonic Emperors influenced the development of European politics. The reform of the Roman Church which went on during the reigns of Otto I and his successors down to Henry III, and which was chiefly due to the efforts of those monarchs, was the true beginning of the grand period of the Middle Ages, the first of that long series of movements, changes, and creations in the ecclesiastical system of Europe which was, so to speak, the master current of history, secular as well as religious, during the centuries which followed. The first result of Henry III's purification of the Papacy was seen in Hildebrand's attempt to subject all jurisdiction to that of his own chair, and in the long struggle of the Investitures, which brought out into clear light the opposing pretensions of the temporal and spiritual powers. Although destined in the end to bear far other fruit, the immediate effect of this struggle was to evoke in all classes an intense religious feeling; and, in opening up new fields of ambition to the hierarchy, to stimulate wonderfully their power of political organization. It was this impulse that gave birth to the Crusades, and that enabled the Popes, stepping forth as the rightful leaders of a religious war, to bend it to serve their own ends: it was thus too that they struck the alliance--strange as such an alliance seems now--with the rebellious cities of Lombardy, and proclaimed themselves the protectors of municipal freedom. But the third and crowning triumph of the Holy See was reserved for the thirteenth century. In the foundation of the two great orders of ecclesiastical knighthood, the all-powerful all-pervading Dominicans and Franciscans, the religious fervour of the Middle Ages culminated: in the overthrow of the only power which could pretend to vie with her in antiquity, in sanctity, in universality, the Papacy saw herself exalted to rule alone over the kings of the earth. Of that overthrow, following with terrible suddenness on the days of strength and glory which we have just been witnessing, this chapter has now to speak. [Sidenote: Henry VI, 1190-1197.] [Sidenote: Philip, 1198-1208.] [Sidenote: Innocent III and Otto IV.] [Sidenote: Otto IV, 1208 (1198)-1212.]