I consider it is useful to explain the motivations of the title that I chose for my contribution: “The relations Church-World from the Council of Trent to the Second Vatican Council”. The first motivation derives from the recent publication of a volume that I wrote about the historical and juridical development of the relations between the Church and the political Communities from the perspective of the public law science. The second motivation, which is strictly linked to the first one, derives from the precise awareness, that I reached during these years of researches about the themes of Public Ecclesiastical Law, that this juridical science has a deep cultural value; this value should be analysed in-depth, as an historian of Law, for a better understanding of the roots of this discipline and its importance in the current, and not only ecclesiastical, society. 


Keywords: Church-worl; Council of Trent; Second Vatican Council.