A great survey of the Church of the East, from its apostolic origins to its mediations with power structures in ancient Persia and the medieval period. It was once the largest church, with presence in India, China, Syria, modern day Turkey, Arabia etc. The book discusses the decline of the Church in the 15th century, which was hastened by the Timurid conquests, political splits and later persecution by Turks, Kurds and Iraqis. It is an excellent source for anyone interested in eastern church history. My only criticism is that the authors pack too much information in each paragraph, making it difficult for the reader to follow. Despite the lack of flow, it is an excellent piece of scholarship.