Spanning thirty-five years of scholarly research, the articles in this collection represent key research findings from Helen J. Nicholson’s studies of the military religious orders and the crusades. Ranging across subjects as diverse as the Templars’ religious practices, Arthurian romance inspired by the events of the Third Crusade, medieval European Christians’ views of Muslims, and a heresy investigation in Ireland, these articles reflect Nicholson’s research into the Templars and Hospitallers as religious institutions, medieval European fictional literature as an historical source, and the trial of the Templars. Aimed at university students, scholars, and enthusiasts on the military orders, this volume makes this research available again to a new generation of readers.