From the establishment of a coherent doctrine on sacramental marriage to the eve of the Reformation, late medieval church courts were used for marriage cases in a variety of ways. Ranging widely across Western Europe, including the Upper and Lower Rhine regions, England, Italy, Catalonia, and Castile, this study explores the stark discrepancies in practice between the North of Europe and the South. Wolfgang P. Muller draws attention to the existence of public penitential proceedings in the North and their absence in the South, and explains the difference in demand, as well as highlighting variations in how individuals obtained written documentation of their marital status. Integrating legal and theological perspectives on marriage with late medieval social history, Muller addresses critical questions around the relationship between the church and medieval marriage, and what this reveals about both institutions.