Yeah. Da Vinci didn't have all that information, and frankly, he probably wouldn't have been very interested in that information at all. Is that reason enough to say that it isn't a masterpiece? In our society we're trained to see all of history through the lens of racial and gender groups fighting for dominance over others. Many look at this painting and see only an offensively white-washed version of near-east culture that seeks to assert the dominance of white European culture. That's not at all what Da Vinci is trying to do or thinking of. There is so much symbolism and character development and spiritual weight behind this picture that you are in serious danger of completely missing out on.