Duke John Adolphus died on 2 July 1704 in Ruhleben, a few days after his son, Adolphus Augustus, had been killed in a riding accident.
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He was born on 8 April 1634 in Ahrensbök, the eldest son of the first Duke of Plön, Joachim Ernest and Dorothea Augusta of Schleswig-Holstein-Gottorp.
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John Adolphus, also known as Hans Adolf (b 1634; d 1704), Duke of Schleswig-Holstein-Sonderburg-Plön, married Dorothea of Brunswick-Wolfenbüttel