The Middle Ages produced a very considerable corpus of latin dialogues but until now a study of this group of texts was missing. In this monograph, the complete dialogue production of the years 1200-1400 (119 works, many of them still unedited) is explored and presented in a detailed repertory which gives title(s), incipit and explicit as well as information on author, date, textual transmission, editions and a summary of the contents. Building on this material, the author can categorize the texts and describe four genres of dialogue (didactic, polemical, introspective and philosophical dialogues) as well as locate them in the literary traditions of Antiquity and the Middle Ages.