institutions were capable of varying their approaches to violence. Reactions depended on context. The crucial element in the medieval world’s relationship with violence was choice. Lay society knew this instinctively whenever it came to assess conduct. Was, for example, one knight sufficiently closely related to another to warrant inclusion in a vendetta, either as an aggressor or a potential victim? Was military service on a proposed campaign covered by the contractual obligations which a vassalowed to his lord? Did a given criminal’s offence merit execution, and had he been convicted by a competent authority? How perilous need a knight’s predicament in battle be, or how desperate the condition of a besieged castle, before surrender could be countenanced without dishonour? The list of such questions is potentially very long because reactions to violence were nuanced by value judgements based on a host of variables.
The Church approached violence in essentially the same way, though its fund of accumulated learning and near-monopoly of the written word naturally enabled it to deal more confidently than the laity on the level of theory and abstraction. Above all, the Church was equipped to impose a degree of systematization and consistency upon the issues which violence raised. It had inherited from Roman Law, the Old and New Testaments, and the early Christian Fathers, pre-eminently St Augustine of Hippo (354–430), various terms of reference by which to analyse instances of violence and pronounce upon their quality. The standard position, which became associated with Augustine and was refined in later centuries, was that the moral rectitude of an act could not be judged simply by examining the physical event in isolation: violence was validated to a greater or lesser degree by the state of mind of those responsible, the ends sought, and the competence of the individual or body which authorized the act.
Thus allowed considerable ideological flexibility, the Church was able to take an active interest in warfare on a number of fronts, including those areas where Latin Christendom came into direct contact with the Muslim world. The second half of the eleventh century was a period of Latin expansion. In the Iberian peninsula the small Christian states in the north were learning to exploit political weakness in Muslim al-Andalus. The most impressive gain was made when Toledo, once the capital of the Visigothic kingdom which had been destroyed by Arab and Berber invaders in the eighth century, fell to King Alfonso VI of León-Castile in 1085. In Sicily Norman warlords, already the dominant force on the southern Italian mainland, gradually eliminated Muslim power between 1061 and 1091. The popes were generally supportive of this expansion. Theirswas not the decisive contribution which brought about Christian successes, for they could do little more than give their encouragement and hope to supervise the difficult task of reorganizing the Church in conquered territories. But the experience of Spain and Sicily was significant because it meant that for two generations before the First Crusade the Church’s central authorities came to see the West as engaged in a single struggle characterized by its deep religious colouring. What the Mediterranean theatres of war had in common, irrespective of the specific circumstances in each case, was that formerly Christian lands were being wrested from infidel control. Consequently the Holy Land, which had been overrun by the Arabs in the seventh century, was bound to attract the Church’s attention sooner or later.
It is important to note a distinction between the senior clerical policy-makers who would one day devise the First Crusade and the lay people who would volunteer to go on it. The perspective of a Mediterranean-wide struggle was visible only to those institutions, in particular the papacy, which had the intelligence networks, grasp of geography, and sense of long historical