Additionally, it is known that Pope Innocent III, having assumed the papacy at the age of 37, had completed his studies in at the University of Paris by 1182 at the age of 21. It was run by the Church and students were considered part of the church and thus wore robes and shaved the tops of their heads in tonsure, to signify they were under the protection of the church. Students operated according to the rules and laws of the Church and were not subject to the king's laws or courts. This presented ongoing problems of students abusing the laws of the city, which had no direct recourse for justice and had to appeal to Church courts. Students were often very young, entering the school at age 13 or 14 and staying for 6 to 12 years. Students were from many different regions speaking many different European languages with all defined by their native language of origin (with Latin being the lingua de franca at school). Eventually the Masters were organized into four "nations" comprising the French, the Picards, Normans and a polyglot of nationalities (predominantly English, German, Scandinavian and East European) referred to as “English,”
The overwhelming majority of students were from the elite or aristocratic classes of Europe as the cost of travel and maintenance of a stay at the university as well as a basic education, was beyond the reach of the poor.
Because students had benefit of clergy that exempted them from the jurisdiction of the king's courts, angry complaints were filed with the Pope's courts. The Pope's courts knew that the University tended to be very protective of its students, and fearing to cause a split like that of Cambridge University from Oxford, they were trying to approach the matter carefully. But Blanche of Castile, regent of France during the minority of Louis IX, stepped in and demanded retribution. The university authorized the city's police to punish the student rioters. The city guardsmen, known for their rough nature, found a group of students and with an unexpectedly heavy hand, killed several of them. The dead students were later rumored to be innocent of the actual riot.
After two years of negotiations, Pope Gregory IX, an alumnus of Paris himself, on April 13, 1231 issued the Bull Parens scientiarum, honoring the University as the "Mother of Sciences", which retrospectively has been called the Magna Carta of the University of Paris, because it guaranteed the school independence from local authority, whether ecclesiastical or secular, placing it directly under papal patronage. The threat of suspension of lectures remained an economic lever: masters were authorized to "disperse" the lectures over a wide range of provocations, which ranged from "monstrous injury or offense" to "the right to assess the rents of lodgings".
Fordham University's medieval website.