If you have interests in the history of Christians in Middle East, Africa, and Asia, The Lost History of Christianity is a great historical account of the Christian Churches in the continent. Philip Jenkins is a professor of Humanities, History and Religious Studies revealed important historical facts of Christianity in this part of the world that is not very well known to many. Professor Jenkins investigated in his scholarly research the roots of the church in the Middle East including the significance of its expansion in South East Asia, India & China. In The Lost History of Christianity Jenkins illustrated the Nestorians, Jacobites, Coptic, Maronite and other eastern Christian churches existence, roles, and their success in Middle East. These Churches were the pioneers in expansion of Christianity in the region, and they flourished and reached many parts of the Far East. However, the main part of the book is the topic of “decline” of these churches. The author contributed different reasons for the lost of the Eastern Churches including wars, hostility, and expansion of other faiths. Jenkins provided in depth details on the wars against Christians and the evidence is illustrated in many examples, such as the Armenian and other Christian genocide and the 1915 Assyrian Sayfo (the Year of the Sword) by the Ottoman Empire. Nevertheless, Jenkins emphasized and discussed the mystery of survival of these Christian communities in the Middle East, Africa, and Asia, and concluded the facts that violence and conquest were major reasons for almost the extinction of the eastern Churches.  The author provided maps and tables in his book; in addition, there are bibliographical notes on each chapter and an index to assist the readers. In reading The Lost History of Christianity, you will discover an important historical part of the Churches of the East. This is an excellent scholarly source and not to be missed.