|Mourne is divided into two catholic parishes, Upper Mourne and Lower Mourne. We are dealing only with Upper Mourne as the Marmions belonged to this parish. The main Catholic church in the parish is St. Colman's also known as Massforth. This church has two outlaying chapels, Our Lady of Lourdes in the townland of Grange - it is usually referred to as Grange Chapel - and was built on a site where Mass was believed to be celebrated in the open air during the penal days. Mrs. Marmion, Sir John's mother gave this site - (see photo below: this is the original field where Mass was held when the Marmions first came to County Down)
The other outlaying chapel is in the townland of Atticall and is usually referred to as Attical Chapel. The pre-reformation Catholic Church which was taken over by the Protestant Church of Ireland is now a ruin. It is situated in Kilkeel and was the first church in Mourne dedicated to St. Colman, who was believed to have lived in the 6th/7th century, in the Co. Down area. There are lots of headstones in this old graveyard but none with the name Marmion. This old church was replaced about 1818 by a new Church of Ireland at Newry Street, Kilkeel. It was in this church that Margaret, Jane and Charity Marmion were married.
Grange Marmions are not descendants of Arthur but they are certainly descendants of his grand or great grand father. I am convinced that the oral tradition is correct - all Mourne Marmions were related!