The fall of the western Roman Empire enfeebles the once powerful and independent provincial bishops and gives a more spiritual outlook to the successors of Peter who sit among the ruins of Rome. The life of Leo the Great illustrates this concentration on religious power amidst the autumnal decay of the more material power and of the wealth which had inflated and secularized some of his predecessors. The life of Gregory the Great marks the culmination of this development. The material world seems to be nearing dissolution and the old Roman spirit of organization, which is strong in Gregory I., is directed to the creation of a moral and religious dictatorship. There are still flickers of independence in remote bishoprics, and the East is irrecoverably removed, but the disordered state of Christendom cries for a master. Europe is young again, with a vicious impulsive youth, and the rod of Rome falls healthily on its shoulders; and the paralysis of civic government and land-tenure in Italy inevitably casts secular functions and large possessions upon the one effective power that survives. An elementary royalty begins to attach to the Papacy: the function of ultimate tribunal in that violent world is imposed on it almost by public needs: and, though Gregory is personally disdainful of culture, the Church, and the monastic refuges it consecrates, preserve for a wiser age to come some proportion of the wisdom of the dead age.
With Hadrian I. a new phase opens. The possession and administration of "patrimonies," or bequeathed estates, give place to the definite political control of whole provinces, under the protection of a powerful and conveniently remote King of the Franks. In the ninth century, Nicholas I. consolidates and extends the new power, both as temporal and spiritual ruler. The vice and violence of Europe still justify or promote the growth of a great spiritual autocracy, and the illiteracy of Europe--for culture has touched its lowest depth--permits the imposition on it (in the "False Decretals," etc.) of an impressive and fictitious version of the bases of Papal claims. Then Rome, which has hitherto had singularly few unworthy men in the chair of Peter, becomes gradually degraded to the level of its age, and the Papacy passes into the darkness of the Age of Iron: which is fitly illustrated by the Pontificate of John X. Gregory VII. shows its restoration to spiritual ideals and the union of monastic severity with the Papal tradition; and this steady creation of a machinery for dominating the vice and violence of Europe is perfected in the extraordinary work of Innocent III., who would, for its moral correction, make Europe the United States of the Church and treat its greatest monarchs as satraps of the Papacy.