This book presents the first full-scale study of the Tractatus de penitentia (C.33 q.3) in Gratian's Decretum , which became the textbook for canon law and served as the basis of the church's developing jurisprudence, in theory and in practice. The treatise on penance stands out as a distinct, overtly theological section of Gratian's work and was long suspected of being a later addition to the Decretum . As a result, the treatise has not received...