Thanks Hallmark,
I think the Thomas Johnston of Glennan I am looking for was church of Ireland . The Harpurs were from Gorestown which I think is co Tyrone.
I have lots of photo's of graves in Moy and Killyman and I think possibly Galbraith and Thomas Johnstons parents may have been from Derrygally.
I will take another look at the graves in Monaghan and see if I can find a C of I graveyard
