The papers contained in this book reflect the ideas presented at the colloquium held on the same subject. The event, sponsored by the Nordmann Foundation, was organized to the memory of the late Jean Nordmann by Prof. Claude Klein, Jerusalem, and Prof. Thomas Fleiner, Institute of Federalism, University of Fribourg. Jean Nordmann and his family have always supported the good relations between the University of Fribourg and the Hebrew University in Jerusalem. The Nordmann Foundation was later created to develop further the cooperation between the two universities, thus contributing substantially to the understanding of the Jewish and Christian communities, notably in Switzerland.