Thanks, everyone. I find these tunes so interesting that they are religious tunes and folk tunes at the same time.What I find so frustrating is there seems to be so little information about the history of The Breastplate Of Patrick. It is fascinating to see it being sung with a variety of tunes the way many folk tunes are sung. Using the melody Slane as the tune for Be Thou My Vision suggests to me that the arranger may have seen a connection between the two tunes as well. By the way, thanks everyone for the cyberhymnals. I'm starting to get quite a collection of them.

Bhuel, beidh mé ag caint libh aríst,
Brían