The Book of Union by Babai the Great (d. 628) is a compendium of christological texts by the famed author at a time when the christological position of the Assyrian Church of the East (also known as the ‘Church of the East’ or the ‘Church of Persia’) became crystalized.
It is the finest representation of the Christology of the Church in Persia, in contrast to diaphysite expression of Byzantium in the Roman East, and the miaphysite expression of the Church in Alexandria and its dependencies. The christological expression of the Church of the East was standardized and canonized by Babai in his christological magnum opus. Accompanied by an introduction and English translation, this volume presents an indispensable text for the study of Christology and its development.