St. Peter & St. Pauls' Cathedral, Glendalough - Credit: Wikimedia Commons
St. Peter and St. Pauls' Cathedral, Glendalough"A New History of Ireland" T. W. Moody, F. X. Martin, F.J. Byrne and Cosgrove, A: Oxford, OUP, 1976 is a former cathedralGlendalough Visitors Guide, Produced by "The Office of Public Works" (Oifig na nOibreacha Poibli), Glendalough, County Wicklow. in the Republic of Ireland:Visit Wicklow it is within the same enclosure as Our Lady's Church and the Round Tower. "The Cathedrals of the Church of Ireland" Day, J.G.F./ Patton, H.E. p77: London, S.P.C.K., 1932 Read more on Wikipedia
Source: en.wikipedia.org