The case study presented in this article is an analysis of Portuguese literary manuscripts which deal with religious Jewish controversies during the Middle Ages (13th to the 15th centuries). These documents came down to us through the subsequent centuries and are available in the Libraries of Portugal. The article is intended to make known variegated documents of religious controversies over three centuries, while, at the same time, we shall draft a brief presentation of their authors, except for anonymous works. In the second part, we shall proceed with a definition of this particlar literary genre as well as analyze the characteristics and also the common features of the different works. In the end, we shall investigaate the discourses, motivations, and the different authors who have influenced the writing of these medieval controversies.