The Prince-Archbishopric of Bremen was an ecclesiastical principality of the Holy Roman Empire and the Catholic Church that after its definitive secularization in 1648 became the hereditary Duchy of B
The Duchy of Bremen around 1655, the Imperial City of Bremen is insufficiently demarcated, bottom right in pink the Duchy of Verden
The Bremian ecclesiastical province (dark grey) with its remaining three suffragans around 1500, thus after disentangling Bremen's Scandinavian suffragan dioceses, as well as neighbouring provinces in Central Europe.
Territory of the Prince-Archbishopric from a late 16th-century atlas
John Frederick of Schleswig-Holstein-Gottorp was the Lutheran Administrator of the Prince-Archbishopric of Bremen, the Prince-Bishopric of Lübeck and the Prince-Bishopric of Verden.
