This book contains a collection of essays in honor of Aryeh Grabois, Professor of Medieval History at the University of Haifa. These essays are devoted to such medieval themes as interfaith relations, the Crusades, Jewish history and feudal monarchies, all areas in which A. Grabois has himself forged new directions in research. Among the contributors are David Abulafia, Elizabeth Brown, Franco Cardini, John Cowdrey, Yvonne Friedman, Jeannine Horowitz, Jacques Le Goff, Elena Lourie, Jean Richard, Jonathan Riley-Smith, Kenneth Stow, and Avrom Saltman. Aryeh Grabois is a Professor of Medieval History at the University of Haifa. His vast erudition and learning have enriched students and scholars in many areas of medieval studies. Among the institutions with which he has been associated are the University of California at Berkeley, the Institute for Advanced Study, Princeton, the École des Hautes Études, Paris, the University of Mainz and the Hebrew University of Jerusalem. Among his books are Civilisation et Société dans l'Occident Médiéval, (1983); Les Sources hébraïques du Moyen Age (Typologie des sources du Moyen Age Occidental), vol.1 (1988), vol.2 (1993).