"John Frederick of Schleswig-Holstein-Gottorp (born 1 September 1579 in Gottorp, a part of today´s Schleswig; died 3 September 1634 in Altkloster [nds], a part of today´s Buxtehude) ...
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was the Lutheran Administrator of the Prince-Archbishopric of Bremen, the Prince-Bishopric of Lübeck and the Prince-Bishopric of Verden." - (en.wikipedia.org 31.01.2020)
