Answer:
The entire structure of European society changed during the 12th and 13th centuries, and there was a time when this change was attributed largely to the Crusades. Historians now, however, tend to view the Crusades as only one, albeit significant, factor in Europe’s development. It is likely that the disappearance of old families and the appearance of new ones can be traced in part to the Crusades, but generalizations must be made with caution. It should, moreover, be remembered that, while some Crusaders sold or mortgaged their property, usually to ecclesiastical foundations, others bequeathed it to relatives. The loss of life was without doubt considerable; many Crusaders, however, did return to their homes.
The sectors acquired by burgeoning Italian cities in the Crusader states enabled them to extend their trade with the Muslim world and led to the establishment of trade depots beyond the Crusade frontiers, some of which lasted long after 1291. The transportation they provided was significant in the development of shipbuilding techniques. Italian banking facilities became indispensable to popes and kings. Catalans and Provençals also profited, and, indirectly, so did all of Europe. Moreover, returning Crusaders brought new tastes and increased the demand for spices, Oriental textiles, and other exotic fare. But such demands can also be attributed to changing lifestyles and commercial growth in Europe itself.
The establishment of the Franciscan and Dominican friars in the East during the 13th century made possible the promotion of missions within the Crusade area and beyond. Papal bulls granted special facilities to missionary friars, and popes sent letters to Asian rulers soliciting permission for the friars to carry on their work. Often the friars accompanied or followed Italian merchants, and, since the Mongols were generally tolerant of religious propaganda, missions were established in Iran, the Asian interior, and even China. But, since Islamic law rigidly prohibited propaganda and punished apostasy with death, conversions from Islam were few. The Dominican William of Tripoli had some success, presumably within the Crusaders’ area; he and his colleague Riccoldo di Monte Croce both wrote perceptive treatises on Islamic faith and law. Other missionaries usually failed, and many suffered martyrdom.
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