The Doctrine of Addai, The Apostle is a book written by George Phillips and published in 1876. The book is a translation of the Syriac text of the Doctrine of Addai, which is a document that describes the early Christian church in Edessa, a city in modern-day Turkey. The Doctrine of Addai is believed to have been written in the 4th century and is considered to be one of the most important sources of information about the early Christian church in...