In the time of Charlemagne each cathedral possessed a school in which were taught arithmetic, theology, singing, and sometimes medicine; the Episcopal College had medical teachers who gave advice and dressed wounds at the doors of the Church of Notre Dame, Paris; but when the medical profession had been divorced from the sacerdotal by councils and popes, many of these cathedral schools closed. In order to preserve the jurisdiction which they for a long time had exercised over the learned professions, many were erected into universities, and thus the clergy gave instruction in philosophy, theology, and later in medicine. During the thirteenth century arose many of the great universities in Europe, notably those of Bologna, Padua, and Naples, in Italy; of Paris, Montpellier, and Toulouse, in France; of Valencia and Tortosa, in Spain; of Oxford, in England. Pope Innocent III by papal bull guaranteed that the professors and students at Paris should be exempt from all excommunications save those which emanated directly from the Holy See; French sovereigns conferred many privileges upon the universities, and soon the members of the University of Paris formed practically a second city, with its own laws, customs, police, citizens, and magistrates. Still, however, all science belonged to the clergy, and its teachers, though removed from the cloister, were none the less Roman Catholic; so that the popes reigned over the people through the parish clergy, and over{090} the latter by the clerical teachers and professors. Nevertheless, in all candor it must be acknowledged that these studious men, thus associated together for mutual instruction and emulation in learning, contributed, in a large measure, to elevate Christian civilization above all others, though several generations were required to secure the results calculated to make men celebrated; hence the early periods of the universities developed very few names. Many were conspicuous by their love of instruction, but not by originality of research. Men undertook expensive and wearisome voyages without encouragement or hope of reward, simply to obtain some rare manuscript or to hear some renowned professor; and they appeal to us of the nineteenth century by their devotion, if not by the results of their work.