I am wondering about the location of the townland of Breagh? As it seems that if it was partly in Portadown as there was a few Catholic churches in it's area to choose from.
To explain in the excellent Irish Genealogy site it has both Armagh and Lurgan options, yet in a number of look ups refer to Drumcree in Portadown being in both Armagh and Lurgan. Which is a bit confusing as it also brings in Loughgall as well. Is this the case?