As the oldest organized religion in Sassanian Iraq, Judaism serves as a kind of model for other religious organizations in the region. After considering the growth of Judaism in Iraq during the Sassanian period, Morony notes the connections between the Jewish and Aramaean populations as well as the intermixed ethnic communities in which Jews played a part. Social, administrative, and religious issues are all considered. Messianic expectations as they continued to develop in the Jewish community in diaspora round out this discussion of Judaism as a fully developed religion in Iraq under Islamic rule.