honestly NO... if you're going to do a historical drama at least make it somewhat how it was in the period. A black queen? No. Black dukes? No other ethnic minorities in England at the time were not of high Society so portraying them as such is re-writing history, which I know BLM and 2020 is so keen on doing but it cannot be done, sorry.
Shonda Rhimes should have left this alone and done her black girl magic on another more modern story as opposed to one set in such a rigid set society in a period that had no place for minorities.