Roman Catholic Diocese of Wrexham Tags: Clerical Administrative Region, Diocese.The Roman Catholic Diocese of Wrexham is a diocese of the Latin Rite of the Roman Catholic Church in Wales. The diocese is a suffragan of the Archdiocese of Cardiff directly subject to the authority of the Pope. thumbnail point area (km2) 8.361e+09 country Wales Established 12 February 1987 jurisdiction Diocese province Roman Catholic Archdiocese of Cardiff territory Gwynedd, Anglesey, Denbighshire, Flintshire, Wrexham latitude 52.92 longitude -3.57 Learn more... Loading...