This study of Burchard's 'Decretum', a popular book of Catholic canon law compiled just after the year 1000, sheds new light on the development of law and theology long before the Gregorian Reform, normally considered as a watershed in the history of the Latin Church. Practical episcopal concerns and an appreciation of new scholarly methods led Burchard to be dissatisfied with the quality of contemporary jurisprudence and particularly with the teaching texts available to local bishops. Drawing upon new manuscript discoveries, the author shows how Burchard tried to create a new text that would...