During the high Middle Ages the university system rose in popularity. The different university’s specialized in different degrees, such as the university of Paris focused was on the study of theology and the university of Bologna focused on law. The degrees of students who had graduated from a university that was supported by a pope or high monarch were recognized throughout Europe. To redeem a degree the student had to complete an oral exam and sometimes debate an argument with faculty after the course of study was completed. The lectures from which they learned were normally held in cathedral halls. Because the books and libraries that students needed for studying were scarce the students usually had to rent books in order to fully understand their classes.