The significant changes in early modern German marriage practices included many unions that violated some taboo. That taboo could be theological and involve the marriage of monks and nuns, or refer to social misalliances as when commoners and princes (or princesses) wed. Equally transgressive were unions that crossed religious boundaries, such as marriages between Catholics and Protestants, those that violated ethnic or racial barriers, and those that broke kin-related rules. Taking as a point of departure Martin Luther’s redefinition of marriage, the contributors to this volume spin out the multiple ways that the Reformers’ attempts to simplify and clarify marriage affected education, philosophy, literature, high politics, diplomacy, and law. Ranging from the Reformation, through the ages of confessionalization, to the Enlightenment, Mixed Matches addresses the historical complexity of the socio-cultural institution of marriage.