"Christendom: The Triumph of a Religion" by Peter Heather is a comprehensive exploration of the history of Christianity in Europe from AD 300 to 1300. This hardcover book delves into the rise and spread of the Christian Church, examining its impact on ancient Rome and medieval Europe. With 736 pages and illustrations, this work offers a detailed account of the pivotal events and ideas that shaped the course of Christian history during this period. Written in English and published by Knopf Doubleday Publishing Group, this book is a valuable resource for those interested in religion and history.