Fun fact, medieval Christians in some parts of Europe actually believed that “moors” (a catch all term for Africans at the time) with black skin would become white if they converted to Christianity, and there were many popular tales of this happening. Race as a concept hadn’t really been invented yet, but medieval people did notice that people they encountered who had dark skin often practiced Islam and wrongly assumed that believing in Islam was the cause of the dark skin rather than it just being who happened to convert.