With the possible exception of Umberto Eco, medieval scholars are not used to getting much media attention. We tend to be a quiet lot (except during the annual bacchanalia we call the International Congress on Medieval Studies in Kalamazoo, Michigan, of all places), poring over musty chronicles and writing dull yet meticulous studies that few will read. Imagine, then, my surprise when within days of the September 11 attacks, the Middle Ages suddenly became relevant. As a Crusade historian, I found the tranquil solitude of the ivory tower shattered by journalists, editors, and talk-show hosts on tight deadlines eager to...