 Complete the following phrase:  A large part of Kedars studies deals with the crusades and the Frankish Kingdom of Jerusalem, established in the wake of the First Crusade. In these studies he exhibits an ability to change thinking through a rigorous and imaginative treatment of source-material that has often been ignored by others and to peel away unfounded assumptions and unwarranted traditions of historical orthodoxy. Topically, he has discussed the relationship of crusading and conversion; demography; intellectual, ecclesiastical, legal and military history; the relationships of the Frankish rulers with their indigenous subjects; medicine; pilgrimage; eremitism; taxation; topography; mutual perceptions of motivation by Franks and Muslims; and much more. His longitudinal examination of the descriptions of the 