This brief introduction to the state of Christianity in Iraq during the ascendancy of Islam begins with a discussion of the friction between Christians and Magians. The political role of the church among the Sassanians, both internally and externally, is addressed. With the Islamic conquest various traditions circulated regarding the tolerance of Christianity within Muslim jurisdiction. Morony skillfully navigates these traditions, providing a plausible historical view. The formation of the Assyrian Church of the East’s doctrine and identity as well as their schools, monasteries, laws, and their sense of community and separateness are considered. The contrast with Monophysites with their “Nestorian” competitors rounds out the discussion.