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 the Crusades and the Latin East and chaired the board of the Israel Antiquities Authority, and is currently vice-president of the Israel Academy of Sciences and Humanities. He is a corresponding member of the Medieval Academy of America and of the Monumenta Germaniae Historica (Munich).

Volume 5 of the Cambridge World History series uncovers the cross-cultural exchange and conquest, and the accompanying growth of regional and trans-regional states, religions, and economic systems, during the period 500 to 1500 CE. The volume begins by outlining a series of core issues and processes across the world, including human relations with nature, gender and family, social hierarchies, education, and warfare. Further essays examine maritime and land-based networks of long-distance trade and migration in agricultural and nomadic societies, and the transmission and exchange of cultural forms, scientific knowledge, technologies, and text-based religious systems that accompanied these. The final section surveys the development of centralized regional states and empires in both the eastern and western hemispheres. Together these essays by an international team of leading authors show how processes furthering cultural, commercial, and political integration within and between various regions of the world made this millennium a 'proto-global' era.