The knowledge of both Arabic and Hebrew distinguishes Ramon Martí (ca. 1220 ? ca. 1285) among the theologians of his century and turn the Catalan Dominican into the prototype of a well-trained missionary, who has first-hand access to the sources and traditions of his interlocutors, where he found the argumentative resources for his polemics. The present book is a pilot study for the edition of Ramon Martí?s chef d?oeuvre, his monumental Pugio fidei, which is fundamental for the history of Christian-Jewish and faith-reason polemics. The volume collects codicological analyses, doctrinal studies and text editions by Philippe Bobichon, Alexander Fidora, Ann Giletti, Görge K. Hasselhoff, Ryan Szpiech, Eulàlia Vernet i Pons, Syds Wiersma and Yosi Yisraeli.