Shadow of the Third Century: A Revaluation of Christianity is a book written by Alvin Boyd Kuhn with the goal of exposing the truth about christianity which he believes has produced a great deal of clearly irrational behavior. It is the hypothesis of Kuhn that there has been significant effort to suppress, hide and even destroy the true history regarding christianity and to expose it as a religion that was constructed to fit the ideals of its leaders instead of merely following the teachings of Jesus. This is an important book for those who are interested in alternative christian beliefs than those in the main stream, and has been popular among people who have studied the gnostic gospels and writings as well as the Da Vinci code writings.