Abstract

In 1245 Canon Law reaches an apex. A Lawyer-Pope Innocent IV proclaims at the Œcumenical Council of Lyons the prestige of Canon Law and his professors. Canon Law is perceived as a new and sometimes controversial ecclesiastical science of power. This new status can be explained by the growth of the ius commune in Italian universities and the rivalries between Roman Law, Canon Law and theology. Innocent IV promotes the figure of the ecclesiastical judge. He also delineates an ecclesiology where the world would be united by an universal religion of Natural Law.