I am now pretty sure now that the Castle of Dromore IS the one at Blackwater Bridge near Kenmare on the ring of Kerry.

There are records extant of a visit by Boulton to the family there and it is said (though this is not substantiated) that he wrote the song for the family as a thankyou after his visit.

I thought the castle had been built in the 1890's by a tennis player but I was wrong. Apparently it was built in the mid 1800's (c. 1840 or so) by a local Protestant family. There is still a chapel there.

Jim