²⁰Bourke, Edward, Alan R. Hayden, Ann Lynch. Skellig Michael, Co. Kerry: the monastery and South Peak: Archaeological stratigraphic report: excavations 1986–2010. Rep. Dublin: Department of Environment, Heritage and Local Government: Office of Public Works, 2008. 22-23.
The Ballinskelligs monastery may have been founded as early as the 12th century, but was clearly well established by the late thirteenth century.