You jest, but sites such as http://medievalpoc.tumblr.com/ have started documenting the presence of non-white people in historical works of art, and it might be surprising just how much is out there. Even in some cases, the popular presentation of images has had people of color cropped out when compared to the original full image.
Absolutely, I jested only in part, white washing is far from a new phenomenon. After all, what colour was Jesus?