Benjamin Z. Kedar, Professor Emeritus of History at the Hebrew University of Jerusalem, is a leading historian of the crusades and the Frankish Kingdom of Jerusalem, and the founding editor of the journal Crusades. He has employed varieties of the comparative approach in his Merchants in Crisis (1976), Crusade and Mission (1984), and in numerous articles. He has also proposed to use series of aerial photographs of the same area, shot at different points in time, as reliable sources for the history of Palestine/Israel from 1917 onward. Kedar served as president of the Society for the Study of t...