There's no mystery more compelling and intriguing in Christianity than the question of whether Jesus Christ had children or not, perhaps with Mary Magdalene as the mother. The Da Vinci Code revived the controversy for yet another generation, built on a long history of speculation and research. From the time of Jesus to the present, individuals and groups--often meeting in secret--have claimed both special knowledge and blood-ties to Jesus himself. True or not, the concept is as fascinating as it gets, and through history individuals and groups haven't been shy about exploiting the possibility for their own purposes.