Amazon.com: Books: Truth and Fiction in the Da Vinci Code: A Historian Reveals What We Really Know about Jesus, Mary Magdalene, and Constantine — Quite an excellent resource for people who are interested in learning more about the real historical background that underlays the DaVinci Code.

Check our the other books by this auther as well – he does a wonderful job of tracing the process by which the books of the bible became part of the accepted canon.