Responses

I think its the emperor AND the duke's late wife. The emperor mentioned that he didn't get the thing he really wanted from the war. My theory is that he some how slept with the duke's wife, probably before they met/married and had a baby. And then the FL 'mom' is clearly being set up to be the empress' sister and the great treasure she stole was the FL. Thats just my theory tho could be completely wrong
Someone please who her father is i can't wait no more