Since it was first published in Hebrew in 2000, this provocative book has been garnering acclaim and stirring controversy for its bold reinterpretation of the relationship between Judaism and Christianity in the Middle Ages, especially in medieval Europe. Looking at a remarkably wide array of source material, Israel Jacob Yuval argues that the inter-religious polemic between Judaism and Christianity served as a substantial component in the mutual formation of each of the two religions. He investigates ancient Jewish Passover rituals; Jewish martyrs in the Rhineland who in 1096 killed their...