Roman Catholic Diocese of Ardagh and Clonmacnoise Roman Catholic Diocese of Ardagh and Clonmacnoise The Diocese of Ardagh and Clonmacnoise () is a Roman Catholic diocese in Ireland. The diocese is entirely within the Republic of Ireland and contains most of counties Longford and Leitrim, with parts of counties Cavan, Offaly, Roscommon, Sligo and Westmeath. The main towns in the diocese are Athlone, Ballymahon, Carrick-on-Shannon, Edgeworthstown, Granard and Longford. The union of the sees of Ardagh and Clonmacnoise, which had been proposed in 1709, was carried into effect following the death of Stephen MacEgan, Bishop of Meath on 30 May 1756, who had been administering the see
County Meath Gaeltacht areas in the province of Leinster, at Ráth Chairn and Baile Ghib. Meath has seven land borders and also a small stretch of coastline stretching from Mornington to Gormanston beach. The counties that Meath border are; Dublin, Westmeath, Louth, Offaly, Kildare, Cavan, and Monaghan. There are eighteen historic baronies in the county. They include the baronies of Morgallion and Ratoath. While baronies continue to be officially defined units, they are no longer used for many administrative purposes. Their official status is illustrated by Placenames Orders made since 2003, where official Irish names of baronies are listed under "Administrative units".