Because it has something to do with The Holy Grail
Now, I've just realised... the name of the English knight in Da Vinci Code was Leigh Teabing, right? Clever, Dan Brown. The name derives from the names of the authors of The Holy Blood and The Holy Grail -- Richard Leigh and Michael Baigent. The surname's an anagram. Very clever. So, do I get a prize? Or is it actually an already widely known fact?