The reign of Alfonso VII occupied more than a quarter century during which the political landscape of medieval Spain was altered significantly. It was marked by the enhancement of royal administration, an increased papal intervention in the affairs of the peninsular church, and the development of the church's territorial structure. With the publication of The Kingdom of Leon-Castilla Under King Alfonso VII, 1126-1157, Bernard Reilly completes a detailed, three-part history of the largest of the Christian states of the Iberian peninsula from the mid-eleventh through the mid-twelfth century. Like his earlier books on the reigns of Queen Urraca and King Alfonso VI, this will no doubt be an essential resource for all students of European and Spanish history and to anyone investigating the antecedents of Castile's eventual preeminence in Iberian affairs.