The question of Christian-Muslim relations is one of enduring importance in the twenty-first century. While there exists a broad range of helpful overviews on the question, these introductory texts often fail to provide readers with the depth that a thorough treatment of the primary sources and their authors would provide. In this important new project, Charles Tieszen provides a collection of primary theological sources devoted to the formational period of Christian-Muslim relations. It provides brief introductions to authors and their texts along with representative selections in English translation. The collection is arranged according to the key theological themes that emerge as Christians and Muslims encounter one another in the seventh to fifteenth centuries. The result is a resource that offers students a far better grasp of the texts early Christians and Muslims wrote about each other and a better understanding of the important theological themes that are pertinent to Christian-Muslim dialogue today.