Frederick II of Germany was an Arabic-speaking Holy Roman Emperor who retook Jerusalem in 1229 without striking a blow, but at the same time he was under a ban of excommunication from the pope; during the late fourteenth century, Henry Bolingbroke (many years before he became the paranoid and brutal King Henry IV of England) behaved as a pilgrim and holy warrior, intent upon creating a chivalric reputation for himself in northern Europe and the Holy Land.
The motives of crusaders have long intrigued historians, and, self-evidently, faith lies at the heart of holy war. From a modern-day western perspective, extreme religious fervor is often synonymous with the fanaticism of minorities, but in the Europe of the central Middle Ages crusading was regarded as virtuous and positive. It was a society saturated with religious belief in which faith provided the template and the boundaries for almost every aspect of behavior and where recognition of divine will and fear of the afterlife were universal. The fight against the enemies of God offered people a way to evade the torments of hell and this is one reason why crusading became a fundamental feature of medieval life. Everyone from emperors, kings and queens, bishops, dukes, and knights, down to peasants and prostitutes, took part in crusades; they were, in the twelfth and thirteenth centuries at least, a totally mainstream activity, accepted and endorsed by an entire culture and not, as later became the case, simply the preserve of the noble elite.
But religion was not the sole driving force for crusaders. Part of the fascination with the crusading age, and one theme in this book, is to see how other ideas, such as the lure of land and money, a sense of honor and family tradition, a desire for adventure, and the obligation of service, all sat alongside—and sometimes smothered—religion. Given the impossibility of ascribing precise motives to any individual from this distance in time we have to weigh the available evidence and point to trends and probabilities. The actions of most crusaders were shaped by multiple, overlapping reasons, and behavior that may seem contradictory to us was not always viewed as such. When, therefore, crusaders from the mercantile powerhouse of Genoa defeated Muslims and, at the same time, secured a profit for their city, they interpreted their success as a sign of divine approval. In other words, in these circumstances, they comfortably assimilated a close link between money and holy war. Likewise, there was a complex relationship between chivalry and crusading. By the mid-thirteenth century the knightly code had become the quintessential basis of noble life and the pursuance of fame and heroic deeds was—if performed in God’s name—the pinnacle of chivalric achievement rather than, as it can appear to us, purely an exercise in ego-building. Economic motives and military excess could, in some cases, dominate or distract crusading expeditions and, on occasion, this provoked intense criticism. The question of motivation shimmers and shifts across time and space, and trying to trace it is part of the challenge and the excitement of this subject.
I have tried to offer comparable insight into the motives of the Islamic world. To some extent, linguistic restrictions hamper this but an increasing amount of material has been translated from Arabic and the sources and characters that I have chosen to highlight the Muslim perspective are especially rich. Similar themes concerning changes in motive over time, or identifying a complex interplay of motives—most obviously seen in the case of Saladin—will be explored.
The chronological and geographical scope of this book reflects a modern academic consensus on the duration and the extent of crusading. 1 In the decades after the conquest of Jerusalem in 1099 crusading diversified to encompass expeditions in Iberia, the Baltic, North Africa, as well as campaigns against enemies of the Church within Europe,