The epic battle between Islam and Christianity for dominance in the Mediterranean extended over many centuries and occupies a principal place in the history of medieval Europe. Historians of the Middle Ages, however, have tended to take a narrow view of that conflict by focusing primarily on Christian perspectives and the crusades directed to the Holy Land in the twelfth and thirteenth centuries.
Drawing from both Christian and Islamic sources, Reconquest and Crusade in Medieval Spain attempts to redress the imbalance in part by demonstrating that the clash of arms between Christians and Muslims in the Iberian peninsula that began in the early eighth century was transformed into a crusade by the papacy during the twelfth and thirteenth centuries. Successive popes accorded to Christian warriors willing to participate in the peninsular wars against Islam the same crusading benefits offered to those going to the Holy Land. Joseph F. O'Callaghan clearly demonstrates that any study of the history of the crusades must take a broader view of the Mediterranean to include medieval Spain.
Following a chronological overview of the crusading in the Iberian peninsula from the late eleventh to the middle of the thirteenth century, O'Callaghan proceeds to the study of warfare, military finance, and the liturgy of reconquest and crusading. He concludes his book with a consideration of the later stages of reconquest and crusade up to and including the fall of Granada in 1492, while noting that the spiritual benefits of crusading bulls were still offered to the Spanish until the Second Vatican Council of 1963.