Book excerpt: This volume brings together revised and up-dated versions of Giles Constable's classic essays on crusading in the 12th century, along with two major new studies on the cross of the crusaders and the Fourth Crusade, and two excursuses on the terminology of crusading and the numbering of the crusades. Together they show the range and depth of the crusading movement at that time and its influence on the broader history of the period.