>>122675289Well, in Disney's adaptation of the story, Maid Marian is referred to as the niece of King Richard, so depending on which of her parents is related to Richard she would be a Princess (if it is her father) or a Lady (if it is her mother).
I'm generally inclined to believe that she is a Lady rather than a Princess, given how enthusiastic the king is for Marian and Robin to hook up it's less of an issue for the royal family for a Lady to marry a commoner than a Princess (though given this is Disney, this probably doesn't apply anyway).