My ggg grandfather Peter Marron was married to Mary Hughes. Peter was born in 1830 and he had 2 children, as far as I know, Peter and James. James came to Glasgow and married in St Mary RC church in Dennistown in 1875 to Margaret mcDowall who came from Co. Fermanagh. James's marriage certificate states he came from Co. Monaghan. I am assuming that Peter was born in County Monaghan but he may have migrated there.