This is a study of marriage litigation in the archiepiscopal court of York (1300 1500) and the episcopal courts of Ely (1374 1381), Paris (1384 1387), Cambrai (1438 1453), and Brussels (1448 1459). All these courts were, for the most part, correctly applying the late medieval canon law of marriage, but statistical analysis of the cases and results confirms that there were substantial differences both in the types of cases the courts heard and the results they reached. Extensive additional material--over 300 pages--can be found on the Cambridge University Press website...