This is both parts of a two-series set produced by the A&E network which explores the history of Christianity and its impact on the world from the year 0 to 2000. Part 1 (the first four episodes) looks at the time from the Roman Empire until the East/West split in 1054. Part 2 accounts the history of the Western world's most influential religion from around the year 1000, the time of the East/West schism and the Crusades, through the Reformation up to contemporary times.