The power which the Church claimed, and which to a large degree it exercised over the imagination and over the conduct of the Middle Ages, was the power which belonged to its head as the earthly representative and vicegerent of God. No wonder that such power was often abused, and that the corruption among the ministers of the Church was wide-spread. Yet in spite of abuse, in spite of corruption, the Church was the ark of civilization. The religious--no less than the intellectual--life of Europe had revived in the eleventh and twelfth centuries, and had displayed its fervor in the marvels of Crusades and of church-building,--external modes of manifesting zeal for the glory of God, and ardor for personal salvation. But with the progress of intelligence the spirit which had found its expression in these modes of service, now, in the thirteenth century in Italy, fired the hearts of men with an even more intense and far more vital flame, quickening within them sympathies which had long lain dormant, and which now at last burst into activity in efforts and sacrifices for the relief of misery, and for the bringing of all men within the fold of Christian brotherhood. St. Francis and St. Dominic, in founding their orders, and in setting an example to their brethren, only gave measure and direction to a common impulse. Yet such were the general hardness of heart and cruelty of temper which had resulted from the centuries of violence, oppression, and suffering, out of which Italy with the rest of Europe was slowly emerging, that the strivings of religious emotion and the efforts of humane sympathy were less powerful to bring about an improvement in social order than influences which had their root in material conditions. Chief among these was the increasing strength of the civic communities, through the development of industry and of commerce. The people of the cities, united for the protection of their common interests, were gaining a sense of power. The little people, as they were called,--mechanics, tradesmen, and the like,--were organizing themselves, and growing strong enough to compel the great to submit to the restrictions of a more or less orderly and peaceful life. In spite of the violent contentions of the great, in spite of frequent civic uproar, of war with neighbors, of impassioned party disputes, in spite of incessant interruptions of their tranquillity, many of the cities of Italy were advancing in prosperity and wealth. No one of them made more rapid and steady progress than Florence. The history of Florence during the thirteenth century is a splendid tale of civic energy and resolute self-confidence. The little city was full of eager and vigorous life. Her story abounds in picturesque incident. She had her experience of the turn of the wheel of Fortune, being now at the summit of power in Tuscany, now in the depths of defeat and humiliation.