In 'The Death of Queen Jane' (Child #170), the story in the song says that Queen Jane died in labour after a caesarian section (Henry refused to grant Jane's request for a section until it was too late.) "King Henry, King Henry, will you do one thing for me?/Open up my right side and find my baby."
"O no!" cried King Henry "Such a thing I never can do/If I lose the flower of England I would lose the branch too."
This is not true. Jane Seymour, third wife of Henry V111 (who the song is obviously about), died on 25th October 1537, twelve days after giving birth (normally) to Edward.
I think this says something about the people's need to express something about injustice - rather than stick to historical 'fact'.
Just a thought.