Now maybe everybody knows this but me, but I just noticed that when Beethoven set Thomas Campbell's once-famous poem "The Soldier's Dream" to music in 1810-13, he used a melody that is a variant of this very one.

You doubt me? Check it out:

http://www.youtube.com/watch?v=XHAXwQLdyWA

Campbell was a Scot, but Beethoven seems to have thought him Irish. Nobody's perfect.