The book "A Brief History of Christianity. Second Edition. Revised and Supplemented" was written by the famous historian and writer John MacKinnon Robertson. In this book, the author examines the history of Christianity from its beginnings to the present, analyzes the key events, figures and currents of the religion. Robertson explores the impact of Christianity on world history, culture, and society, examining how religion drove, created, and influenced the development of civilization. This revised edition includes new materials and additions that make the book even more informative and relevant for modern readers. A Brief History of Christianity is an essential work for those interested in the history of religion and its influence on the world.