Obviously, writing at the time he did, if he wanted to get published, Maguire HAD to say Lord's daughter, presumably single, rather than describe adultery by the Lord's wife.

There are clear echos of the lord or King disguised as a beggar, to give the story a "happy" ending. The traditional ending, with the gypsy, or 3 or 7 gypsies, often being hanged for stealing a lady, wasn't really suitable for his purposes.