Carrig an Aifrinn. (Irish: mass rock). Various laws were passed during the 16th and 17th centuries, which made the practice of the Roman Catholic religion unlawful in Ireland. Catholic priests suffered severe penalties, including death, for ministering that faith. However, mass was often celebrated secretly, in isolated, open-air locations such as this. The large flat-topped rock visible at this site would have served as a ready made altar. The Penal Laws were largely revoked in 1791and 1829.