At over 800 years old, St. Mary’s Cathedral is one of the oldest cathedrals in Ireland still used as a place of worship. This ancient building in Limerick is a stalwart of Irish heritage and is visibly pockmarked by the trials it has endured. Situated on King’s Island in the middle of the Shannon River in Limerick, St. Mary’s Cathedral overlooks a landscape that must have changed beyond recognition since it was founded here in 1168 AD.