In the period following the collapse of the Carolingian Empire up to the Fourth Lateran Council (1215), the episcopate everywhere in Europe experienced substantial and important change, brought about by a variety of factors: the pressures of ecclesiastical reform; the devolution and recovery of royal authority; the growth of papal involvement in regional matters and in diocesan administration; the emergence of the "crowd" onto the European stage around 1000 and the proliferation of autonomous municipal governments; the explosion of new devotional and religious energies; the expansion of...