Exploring and understanding how medieval Christians perceived and constructed the figure of the Prophet Muhammad is of capital relevance in the complex history of Christian-Muslim relations. Medieval authors writing in Latin from the 8th to the 14th centuries elaborated three main images of the Prophet: the pseudo-historical, the legendary, and the eschatological one. This volume focuses on the first image and consists of texts that aim to reveal the (Christian) truth about Islam. They have been taken from critical editions, where available, otherwise they have been critically transcribed from manuscripts and early printed books. They are organized chronologically in 55 entries: each of them provides information on the author and the work, date and place of composition, an introduction to the passage(s) reported, and an updated bibliography listing editions, translations and studies. The volume is also supplied with an introductory essay and an index of notable terms.