This book is the outcome of a major conference held by Omnes Gentes on the thematic religion, violence, and peacebuilding, celebrating the 100 years of the publication of Quod Iam Diu, the Encyclical of Pope Benedict XV "On the Future Peace Conference" issued on 1st December, 1918. Authors from all continents have provided articles from their field of research and their context to illustrate the importance of religious insights and actions to promote peace in difficult times. Academics, ecclesiastical leaders, pastoral workers, and researchers from around the world, who are involved directly in the work of peacebuilding, shed light on specific contexts, historical perspective and actions, as well as inspiring prospects for the future. Omnes Gentes is a collaboration of the Faculties of Theology of KU Leuven and UCLouvain, Lumen Vitae, and Missio-Belgium. Ce livre est le fruit d'une conference Omnes Gentes qui a rassemble des academiques, des eveques et des chercheurs de tous les continents autour d'une thematique d'importance: la violence, les religions et l'edification de la paix, commemorant de la sorte les cent ans de la publication de Quod Iam Diu, l'encyclique de BenoOEt XV publiee en 1918. Les contributions de cet ouvrage s'enracinent dans des contextes troubles pour illustrer le role majeur des religions dans la promotion de la paix en des temps difficiles. Omnes Gentes associe les Facultes de Theologie de la KU Leuven et de l'UCLouvain, le centre Lumen Vitae et Missio-Belgique, afin de promouvoir la recherche et les publications dans le domaine de l'evangelisation, avec une attention specifique au dialogue entre le Sud et le Nord.