Modern concept of race cannot be applied to the past.
“I want to note that I think this argument begins from a mistaken premise: it is assuming that the divisions we impose today on our culture are fundamentally true in all times and cultures and so we can impose them on people in the past who may have viewed other categories as more meaningful. This is an error, as it ought to surprise no one that social construction is socially constructed (shocking, I know) and so the organization of a society (including questions of ‘who belongs’ and social hierarchy) depends on human perception about what is and is not important”