Christoph Baumer is one of the very few Westerners to have visited many of the most important Assyrian sites, and has written the only comprehensive history of the Church, which now fights for survival in its country of origin, Iraq, and is almost forgotten in the West. He narrates its rich and colourful trajectory, from its apostolic beginnings to the present day, and discusses the Church's theology, christology and uniquely vigorous spirituality. He analyses the Church's turbulent relationship with other Christian churches and its dialogue with neighbouring wold religions such as Zoroastrianism, Manichaeism, Islam Buddhism, Hinduism and Taoism.