I just did a bit of a Google and it appears that all these decades I have thought that the song The Rose of Tralee was by Thomas Moore.

How wrong can you be??!! My excuse is that it was one of the songs we were taught to sing at school and there were a few Thomas Moore songs among them. Oooooops!!!

Wiki says this: The Rose of Tralee The words of the song are credited to Edward Mordaunt Spencer and the music to Charles William Glover, but a story circulated in connection with the festival claims that the song was written by William Pembroke Mulchinock, a wealthy Protestant, out of love for Mary O'Connor, a poor Catholic maid in service to his parents.