Joe,
A long shot. Child 295 John of Hazelgreen. Have you come across anything in your searches on this one? I have a hunch it's at least partly based on real events. The only Hazel Green I can find in Scotland is a few miles SW of Newton Stewart. For various internal reasons I think the ballad is relatively modern, i.e., after the Union. Would Hazley Green have been part of the Garlies Stewart estate? Could John have been one of the Garlies Stewarts in the 17thc? If you have any info or interest it would be politic to start a new thread.

Best wishes and thanks for the current thread,
SteveG