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Old catalog headings: Catholic Church. Diocese of Trier; and, Treves (Diocese)
Catholic Encyclopedia online, Nov. 28, 2006 "Trier" (Diocese of Trier, also Archdiocese of Trier; as the Archdiocese of Trier, already est. sometime in the reign of Charlemagne and mentioned in his will, with Metz, Toul and Verdun as its suffragans; partitioned by several treaties, 1794-1801, its territories on the left bank of the Rhine River reorganized principally as the French Diocese of Trier; territory ceded to Prussia by the Congress of Vienna, reorganized 1821 as the Diocese of Trier, and made suffragan to Cologne)
LC data base, 8/9/84 (hdg.: Catholic Church. Diocese of Trier)