English Summary: Universal peace, creation of a European union, establishment of an international arbitration tribunal, cessation of wars and the end of litigation, a pan-European army to pacify the Middle East, the papacy reduced to the role of spiritual guide following the dismantling of States of the Pope, secularization of ecclesiastical goods, promotion of women in education, training of women surgeons, teaching of oriental languages - all projects that would be relevant today, but dating back to 1307 The purpose of this volume is to introduce the reader to the most important political writings of the Norman jurist Pierre Dubois (c 1255 - c 1321), the reconquest of the Holy Land and the abridgement of the wars and lawsuits of the Frankish kingdom. His vision of reconquest of the Holy Land suggests to him a series of reforms affecting all aspects of the life of Christendom: the establishment of universal peace and the reform of the relationship between Church and State, up to at the foundation of new type schools. French Description: Paix universelle, creation dune union europeenne, etablissement dun tribunal darbitrage international, cessation des guerres et fin des litiges, une armee paneuropeenne pour pacifier le Proche-Orient, la papaute reduite au role de guide spirituel suite au demantelement des Etats du Pape, secularisation des biens ecclesiastiques, promotion des femmes dans leducation, formation de femmes-chirurgiens, enseignement des langues orientales autant de projets qui seraient dactualite aujourdhui encore, mais qui datent de 1307 Le present volume vise a faire connaitre au lecteur les plus importants ecrits politiques du legiste normand Pierre Dubois (c. 1255 - c. 1321), De la reconquete de la Terre Sainte et De labregement des guerres et proces du royaume des Francs. Sa vision de reconquete de la Terre Sainte lui suggere une serie de reformes touchant a tous les aspects de la vie de la chretiente: de letablissement de la paix universelle et la reforme des rapports entre lEglise et lEtat, jusqua la fondation decoles de type nouveau.