Oh, that's really interesting! I did notice the Norse gods... Does the history match up? It looked like the right sort of conflict, but I'm hazy about the details.

And I'd read somewhere that KIng James's lady was quite likely to be Joan Beaufort, whom he married - at least, that's fits the conceit of the poem, which he is writing retrospecively! But that's not the story that DWJ wants to tell. She doesn't mention his early and unpleasant end, either.