"....Looking at that on the map it would explain why they were married in Castleblayney...."
?? They didn't marry in Castleblaney!! They married Derryvally!!
as per Cert!!
First Ballybay Presbyterian church is of social significance to the local Presbyterian community, acting as the sole Presbyterian church, particularly following the closure of Derryvally Presbyterian Church and Cahans Presbyterian Church in 1972.
First Ballybay was constructed in 1786 over an 'Irish mile' from Ballybay, as was the law at the time (Second Ballybay was constructed in the town about 1834).
In 1800 a disagreement in the Derryvally congregation concerning the appointment of a new minister resulted in the construction of Derryvally Presbyterian church only two hundred yards to the north-east