Jews and Christians in Medieval Castile examines the changes in Jewish-Christian relations in the Iberian kingdom of Castile during the pivotal period of the reconquest and the hundred years that followed the end of its most active phase (eleventh to mid-fourteenth century). The study's focus on the Christian heartland north of the Duero River, known as Old Castile, allows for a detailed investigation of the Jews' changing relations with the area's main power players―the monarchy, the church, and the towns. In a departure from previous assessments, Soifer Irish shows that the institutional and legal norms of toleration for the Jewish minority were forged not along the military frontier with Islam, but in the north of Castile. She also examines the Jews' attitudes toward the various powers in the Christian society and shows that they were active players in the kingdom's politics. The book breaks new ground in helping us understand more fully the tensions, and commonalities, between groups of different faiths in the late medieval period.