"[A] thoughtful and well-researched book… for anyone who desires to understand how the concept of the remission of penance became linked to the phenomenon of the crusades, this study provides a valuable analysis… [the author] manages to master a confusing and difficult story that ling has needed this type of patient and painstaking study."Brian Patrick McGuire, Revue d'Histoire Ecclésiastique, Vol. 111, No. 1-2, 2016"Ane Bysted’s meticulously researched book provides an outstanding contribution to the diversification of the study of the Crusades and is a most authoritative case study within the field of medieval theology. It is a challenging, yet essential read for any scholar in either of these disciplines."Jan Vandeburie, The Journal of Religious History, Literature and Culture, Vol. 2, No. 1, 2016