I've got a old booklet of songs - probably published by Wzltons in the 1950s, but the paper cover's come off it; and the note on "Shall My Soul pass through Old Ireland" is: "This beautiful ballad was written in 1920 to the hunger strikers in Brixton prison where Terence MacSwiney, Lord Mayor of Cork, died."

Which implies that it wasn't exclusively about MacSwiney. That would help explain why his name never comes in at all.

But looking at Bingen on the Rhine, I can't see any particular reason to see it as a model for this song. Everything in the earlier song that might have been drawn on was there in real life.