excellent link:
A quote from said link:
"Sweet Dreams and Flying Machines in Pieces on the Ground
What on earth does the great name of Leonardo da Vinci have to do with the Templars, Mary Magdalene, etc.? Not much. Throughout Holy Blood, Holy Grail, the authors refer to their attempts to authenticate a sheaf of modern, privately printed documents, the Secret Dossier or Priory Documents, already mentioned, which have been exposed as hoaxes planted by Pierre Plantard’s sect. And it is only this false source that lists the great artist Da Vinci as one of the Grand Masters of the secret order. Thus there is no Da Vinci connection at all.
What of Brown’s claim that Mary Magdalene appears next to Jesus in DaVinci’s Last Supper? There is nothing to it. The figure is surely intended as John, son of Zebedee. In view of church traditions which imagined John penning his gospel as an old man at the close of the first century, it was traditional to picture John as a callow youth among the disciples of Jesus. In Renaissance painting, this means he winds up looking effeminate, as Jesus himself would were he not sporting a beard.
O Negative
We have several times had to get ahead of ourselves by mentioning the tantalizing notion that Jesus Christ and Mary Magdalene were married, and that their union would have issued in the Merovingian dynasty beloved by the modern French Far-Right. How does the Teabing hypothesis (if we may so denominate it, using the name of Brown’s scholarly character to stand for Brown’s recycling of the fanciful pseudo-scholarship of his mentors) make this connection? There are a number of individual issues tangled up here.
First, is it possible for Mary and Jesus to have been married or at least to have been romantically involved? Of course it is. As all discussions of this issue point out, the Gospel of Philip says, "Now Mary was the favorite of the Savior, and he often used to kiss her on the lips." Indeed, if there is any historical basis to the gospel portrait of Jesus traveling with unattached women (Mark 15:40-41; Luke 8:1-3), we must even consider whether, a la the suspicions of husbands alienated from their wives who have left them to follow the Christian apostles in the Apocryphal Acts, Jesus had been using the group of women as his harem. And in view of parallel cases from the whole history of Mystery Religions and Utopian communities, we cannot dismiss the possibility.
Still, possibility is not probability, as it seems to have become for upholders of the Teabing hypothesis. The notorious tendency of conservative apologists and New Age paperback writers alike is to leap from mere possibility to the right to believe. "If there might be space aliens, we can assume there are." "If the idea of Atlantis is not impossible, we can take it for granted." "If the traditional view of gospel authorship cannot be definitively debunked, we can go right on assuming its truth." No, you can’t. And though Jesus might have had sex with one or many women or men, the mere possibility is of no help. He might have been a space alien, too. Some think he was. But historians don’t."
An amusing and frank text