There were skin color issues not associated with the concept of race for many centuries prior to the 1400s. The book, "The Invention of Race" delves into that. Colorism was an issue. But not as "race." That's why I suggested you look into the Doctrine of Discovery. You'll discover that it did, specific to Moors, Jews, Saracens at first, then to intercontinental development of European race policy in the 1500s. It will take a little research, but you'll find that the Latin word "diversity" was at the heart of the development of geopolitical ideological race as skin color. It's a cool discovery, and a journey you'll find fascinating, once you get into it. Again, the 1400s and the Roman Catholic church were the epicenter. It's a worthwhile discovery. Takes a little digging below the surface, but I can see you're more than capable of that.