The first of the "related threads" above gives some info on tune and words. Essentially
- an old Irish tune (with all the usual caveats)
- words by Harry Boulton (early 20C.?)
- a translation into Irish by Douglas Hyde. Have never heard it, incidentally.

A quick glance at the online catalogue of the Irish Traditional Music Archive (ITMA for short - but don't tell anyone I told you! ;>)>) tallies with this. I may have a chance to confirm on the spot later this week.

Regards