That’s part of the title of this 2004 scholarly article that examines Brown’s Jesus bloodline mythology.  I don’t believe I’ve posted it before (going through the archives this weekend). The author is apparently a medievalist. It’s a succinct, readable dismantling of Brown’s bogus history. Here’s the abstract:

Dan Brown’s bestseller, The Da Vinci Code, has enthralled many readers, but many others have pointed out his errors and raised objections to his dubious conjectures. Of particular interest to Arthurians is Brown’s conspiracy theory (appropriated from other sources) concerning the Grail, but a discussion of that subject also requires consideration of his presentation of Church history and of the role that art plays in the elaboration of the Grail theory.