On March 4th, 1233, in his bull Sufficere debuerat perfidie Iudeorum, Pope Gregory IX complains to the bishops and archbishops of Germany of the many “perfidies” of the German Jews, including their “blasphemies” against the Christian religion, which, he fears, may have an ill effect on Christians, particularly converts from Judaism. He orders the bishops to prohibit Jews from presuming to dispute with Christians and to prevent Christians from participating in such disputations through ecclesiastical censure. Gregory clearly thought that it was dangerous to allow informal discussions or debates about religion between Jews and Christian laymen. At the same time, he was instrumental in the promotion of the two new mendicant orders and in the encouragement of their missionary efforts towards Jews (and to a lesser extent Muslims). Over the course of the thirteenth and fourteenth centuries, the Dominicans in particular became specialists of religious disputation. Laymen were increasingly discouraged or prohibited from engaging in such disputation by both ecclesiastical and royal legislation. This article will examine several key texts involving the dangers of interreligious debate and discussion in the Middle Ages from the perspective of Christian authorities (ecclesiastical, royal or other). Various authors, from Tertullian to Joinville, expressed misgiving about the effects such debate could have on Christian participants and bystanders, and various medieval legal texts, civil and canon, sought to limit or prohibit such debate. [ABSTRACT FROM AUTHOR]

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