john kelly corclare trough

I am looking for any help trying to confirm and trace my great great grandfather john kelly from truagh co monaghan who was married around 1800 to mary cassidy/cassily,cassahly from Listrakelt  derrynoose  which is quite close to monaghan.My great grandfather is confirmed by marriage certificate of my grandfather as Myles kelly who was a brother of a rev father patrick kelly or canon kelly of derrynoose/keady up to his death in 1891.This information is confirmed by a will    .From historical papers   father patrick kelly was a cousin of dr. james donnelly the bishop of clogher whose mother is stated as catharine kelly from  cordlare--- hence my connection -and hope that some information is out there.I know myles kelly and his brother patrick were born in Listrakelt derrynoose in 1806 and 1808 so i can presume that the father who is mentioned as john would have been born in say the era of say 1750- 1785 .i have seen plenty of kelly men in the corclare /errigal truagh area on the griffiths list of 1825 and some on the flax growers list of 1796.

any help or knowledge would be much appreciated.

sean kelly ex armagh now manchester uk