I thought about the Holy Grail ever since the Indian Jones Movie and since the DaVinci Code came out and I had a chance to read it and as I read through, I remembered that I had read about a HadIth of Prophet Muhammad that could be a missing link between the holy bloodline -the Holy Grail that DaVinci Code refers to. Before I quote the Prophets' saying it is important to remember that Imam Ali was his blood relative of the Prophet and so was Fatima obviously.
"Both in this world and in the hereafter, I am the nearest of all people to Jesus, the son to Mary. The Prophets are paternal brothers; their mothers are different, but their religion is one." (Al-Bukhari Hadith # 652)
I had to look up the origins of the Order of the Chris and as it turns out it goes back to the Templars!!