It might be worth checking out prosopographic studies on the crusades and the crusade states, and historians working with prosopograhyprosopograhy. For a start try:
- Jonathan Riley-Smith: The First Crusaders, 1095-1131
- Alan Murray: The Crusader Kingdom of Jerusalem: A Dynastic History, 1099-1125
- Mary Whitby (ed): Byzantines and Crusaders in Non-Greek Sources, 1025-1204
- James Powell: Anatomy of a Crusade, 1213-1221