Heidecker argues that Lothar's divorce action was a critical episode in the development of the medieval matrimonial doctrines that defined marriage as monogamous and indissoluble, His judgment is borne out by the dozen or so reference to the case in the Decretum Gratiani.... His narrative flows smoothly and his analysis of the whole affair is cogent. Heidecker's work represents a welcome and important contribution to the history of medieval marriage doctrine, as well as to the history of the later Carolingian monarchy.- James A. Brundage (Journal of Ecclesiastical History) Heidecker provides an accessible, lucid, and well-researched account of this notorious affair.... Now that Heidecker's valuable contribution to the history of politics, marriage, and law in the Carolingian world is available in English, it should gain the wider audience it deserves. The inclusion of some relatively long source selections, with original Latin passages in footnotes, makes the book ideal for graduate seminars. The book's genealogical charts are indispensible for understanding the text, especially for anyone not well versed in this period of Carolingian history.- Valerie L. Garver (Early Medieval Europe)