Coacta voluntas est voluntas: Baptism and Return in Canon Law

Throughout the early Middle Ages, the border between Christianity and Judaism was comparatively permeable, and baptized Jews, particularly those baptized under duress, frequently returned openly to Judaism. While modern scholars of Jewish-Christian relations often assume that medieval canon law always forbade this, a single norm governing converts’ re-conversion, or reversion, did not begin to emerge until the mid-twelfth century with the Decretum Gratiani. The Decretum established the preeminence of the canon that barred Jewish baptizands’ reversion and acted as a catalyst for discussions about the limits of consent and coercion, baptism and conversion. These debates provided the foundation for the mandates of the early thirteenth century that did establish the legal boundary between Jew and Christian which lasted into modernity: so long as baptizands consented, even if under duress, they were Christians and could not return to Judaism.