In spite of the great and constantly increasing corruption the monastic idea during this period had a wonderfully rapid development, and more persistently and successfully than ever before or since the monks urged their claims to be regarded as “the knighthood of asceticism.” A vast number of monkish orders arose, taking the place for the most part of existing orders which had relaxed their rules. These were partly reformed off-shoots of the Benedictine order, partly new organizations reared on an independent basis. New monasteries were being built almost every day, often even within the cities. The reformed Benedictine monasteries clustered in a group around the parent monastery whose reformed rule they adopted, forming an organized society with a common centre. These groups were therefore called Congregations. The oldest and, for two centuries, the most important, of these congregations was that of the Brethren of Clugny, whose ardent zeal for reform in the hierarchical direction was mainly instrumental in raising again the church and the papacy out of that degradation and corruption into which they had fallen during the 10th and 11th centuries. The otherwise less important order of the Camaldolites was also a vigorous promoter of these movements. But Clugny had in Clairvaux a rival which shared with it on almost equal terms the respect and reverence of that age. The unreformed monasteries of the Benedictines, on the other hand, still continued their easy, luxurious style of living. They were commonly called the Black Monks to distinguish them from the Cistercians who were known as the White Monks. In order to prevent a constant splitting up of the monkish fraternities, Innocent III. at the Lateran Council of A.D. 1215 forbade the founding of new orders. Yet he himself took part in the formation of the two great mendicant orders, and also the following popes issued no prohibition.--The papacy had in the monkish orders its standing army. It was to them, in a special manner, that Gregory’s system owed its success. But they were also by far the most important promoters and fosterers of learning, science, and art. The pope in various ways favoured the emancipation of the monasteries from episcopal control, their so-called _Exemption_; and conferred upon the abbots of famous monasteries what was practically episcopal rank, with liberty to wear the bishop’s mitre, so that they were called _Mitred Abbots_ (§ 84, 1). The princes too classed the abbots in respect of dignity and order next to the bishops; and the people, who saw the popular idea of the church more and more represented in the monasteries, honoured them with unmeasured reverence. From the 10th century the monks came to be considered a distinct religious order (_Ordo religiosorum_). Lay brethren, _Fratres conversi_, were now taken in to discharge the worldly business of the monastery. They were designated _Fratres_, while the others who received clerical ordination were addressed