Curious to track down who wrote it, I came across this this piece in The Limerick Leader, which has a bit about it. It gives Archbishop Sheehan (who would be the same I imagine as the "Micheál Ó Síocháin, a priest who used to visit the Ring, Co Waterford Gaeltacht regularly in the early decades of last century" identified in the other thread as the author.

It has Sean O'Riada as setting it to music, but whether that means putting a tune to it, or arranging the tune that was there already is not clear. And it's got some other interesting stuff as well, about other songs, and the context in which they fit.

(There's a better class of local paper in Ireland, some of the time anyway.)