This important new contribution to the history of the body analyzes the role of filth as the material counterpart of sin in medieval thought. Using a wide range of texts, including theology, historical documents, and literature from Augustine to Chaucer, the book shows how filth was regarded as fundamental to an understanding of human history. This theological significance explains the prominence of filth and dung in all genres of medieval writing: there is more dung in theology than there is in Chaucer.