Thanks both, that's brilliant. I've a good mind to work up the five-verse version - the promise followed by the ring makes more narrative sense.

I'm also pleased to see "the hills and the valleys" being covered with corn, instead of "the fields and the meadows" - meadows, of course, aren't where you grow corn. Nice to see it's just a bit of oral mangling.

(Compare "Rosebud in June", which in the Span version makes no agricultural sense at all - "O to plough where the fat oxen graze", indeed. But if it's nonsense, it's genuine orally-transmitted nonsense. (The agricultural story editor seems to have had more input to The Watersons' version.))