The Queen of Scotland (Child ballad 301, Roud number 3878) is a folk song.
[1] The Queen of Scotland tries to lure Troy Muir to her bed.
When she fails, she directs him to lift a stone in her garden, and a hungry snake emerges.
A woman cut off her breast to appease the beast, and the wound healed within an hour.
Nine months later, she bears a son, and her breast was restored.