The Roman Catholic Diocese of Mondoñedo-Ferrol (also known as "Dioecesis Mindoniensis-Ferrolensis") is the northernmost of the four Latin rite suffragan dioceses in the ecclesiastical province of the Metropolitan Archdiocese of Santiago de Compostela, which covers Galicia in the northwest of Spain. The area had previously been home to Britonia, a settlement founded by expatriate Britons in the wake of the Anglo-Saxon invasion of Britain. Britonia was represented by the diocese referred to as Britonensis ecclesia (Britton church) in sources from the 6th and 7th centuries. The bishop has a (main) cathedral (from Latin "cathedra" meaning episcopal seat), a minor basilica and World Heritage Site (Catedral Basílica de la Virgen de la Asunción, dedicated to the Assumption of Mary) in Mondoñedo, administrative Province of Lugo, and a co-cathedral Concatedral de San Julián in Ferrol, administrative Province of A Coruña, as well as a former cathedral which is a minor basilica, Basilica de San Martín de Mondoñedo in Foz, Lugo province. History 866: Established as Diocese of San Martiño de Mondoñedo on Galician territories split off from the Diocese of Oviedo and Metropolitan Archdiocese of Lugo Renamed in 1114 as Diocese of San Martiño de Mondoñedo–Dume, having gained territory from the suppressed Diocese of Dume (in Portugal) Renamed in 1219 as Diocese of Mondoñedo / Mindonien(sis) (Latin), having lost territory to Metropolitan Archdiocese of Braga (Portugal) On 17 October 1954 it gained territory from Diocese of Oviedo, lost territory to Metropolitan Archdiocese of Santiago de Compostela, and exchanged territory with Diocese of Lugo Renamed on 9 March 1959 as Diocese of Mondoñedo–Ferrol / Mindonien(sis)–Ferrolen(sis) (Latin) Some authorities have sought to fix the date of the foundation of this diocese (under its primitive name of Britonia) earlier than the second half of the 6th century, but the later date seems the more probable when we consider that, at the Second Council of Braga (572), Mailoc, Bishop of Britonia, was ranked lowest because of the more recent origin of his see. It seems to have been founded by the Suevian king, Theodomir, converted to Catholicism by St Martin of Dumio, and to have included in its jurisdiction the churches of the Britones (a territory coinciding with that of Mondoñedo) and some of those of the Asturias. In the beginning it was a suffragan of Lugo, until the Goths placed Lugo under the jurisdiction of Braga. After Mailoc no mention is found of the bishops