I had first heard of the Council of Nicea, in which belief in the Trinity was made Church doctrine, from a (former) Rome-trained priest in Catholic school. This book goes into much more detail, and is an easy read. All history is fascinating, but the history of religion is especially important. After all, religion is supposed to be the guiding force in the life of the adherent. The author really did his homework, and anyone who wishes to deny that just has to get some of the books mentioned in the bibliography. A good book for anyone interested in Jesus, even if they skipped over references to him in the Qur'an.