Adrian Fortescue (1874-1923) was recognized as one of England’s foremost authorities on Eastern Christianity and helped to shape the English-speaking world’s understanding of the Eastern Churches. This book is a critical examination of his writings on the subject, analyzing what he said about the Eastern Christian Churches and highlighting his insights into key questions. It focuses on Fortescue’s understanding of the schisms and his thoughts as to how reunion can come about. The book concludes by comparing Fortescue’s perspective to later advances in theology and historical scholarship in order to ascertain the long-term accuracy of his writings.