In high medieval France, men and women saw the world around them as the product of tensions between opposites. Imbued with a Christian culture in which a penniless preacher was also the King of Kings and the last were expected to be first, twelfth-century thinkers brought order to their lives through the creation of opposing categories. In a highly original work, Constance Brittain Bouchard examines this poorly understood component of twelfth-century...