First, I must emphasize the assertion made a moment ago that the constitution of the Irish Church in the eleventh century was _sui generis_. Let us begin by reminding ourselves what it was from the sixth to the eighth century. It was then essentially monastic in character. The rulers of the Church were the abbots of the monasteries, commonly known as the coarbs or successors of their founders. These abbots were sometimes bishops; but whether they were bishops or of lower rank in the ministry, their authority was inherent in their office of coarb. At this period bishops were numerous--more numerous than in later medieval or modern times; and certain functions were reserved for bishops, for example, ordination. No ecclesiastic, of whatever status, could perform such functions, unless he was of the episcopal order. But no bishop, as such, had jurisdiction. The bishops were often subordinate officers in monasteries, reverenced because of their office, but executing their special functions at the command of the abbots. Sometimes a bishop was attached to a single tribe. Sometimes a group of bishops--often seven in number--dwelt together in one place. But in no case, I repeat, had they jurisdiction. Thus ecclesiastical authority was vested in the abbots. The episcopate was bestowed on certain individuals as a personal distinction. Thus the bishops, if they were not also abbots, had only such influence on the affairs of the Church as their sanctity, or their learning, might give them. It may surprise some that so anomalous a system of government should have persisted as late as the eleventh century, in other words for a period of over 500 years. But we must take account of the Danish--or as we should rather call it, the Norse--invasion of Ireland. Danish ships first appeared off the Irish coasts about the year 800. From that time for two centuries Ireland was to a large extent cut off from intercourse with the rest of Europe. The aim of the northern hordes, as it seems, was not mere pillage, but the extinction of Christianity. Ecclesiastical institutions were everywhere attacked, and often destroyed. And these institutions were centres of scholarship. Heretofore Ireland had been the special home of learning, and had attracted to itself large numbers of foreign students. But in those disastrous centuries its culture was reduced to the lowest point. In such circumstances it was not possible that the organization of the Church should be developed or strengthened. The Danish domination of the country must have tended to stereotype the old hierarchical system. It might, indeed, suffer from deterioration: it probably did. But it could not be assimilated to the system which then prevailed on the Continent. We should expect that the constitution of the Church in the eleventh century, whatever abuses may have crept into its administration, would in principle be identical with that of the pre-Danish period.