"John Adolphus of Schleswig-Holstein-Sonderburg-Plön (German: Johann Adolf or Hans Adolf; 8 April 1634, Ahrensbök – 2 July 1704 Ruhleben) was the second Duke of Schleswig-Holstein-Sonderburg-Plön, which ...
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had been created by a division of the Duchy of Schleswig-Holstein-Sonderburg." - (en.wikipedia.org 23.12.2020)
