| John the Younger | 
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| Born | 25 March 1545 Haderslev, Denmark-Norway | 
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| Died | 9 October 1622(1622-10-09) (aged 77) Glücksburg, Duchy of Schleswig-Holstein-Gottorp, Holy Roman Empire | 
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| Spouse | Elisabeth of Brunswick-Grubenhagen Agnes Hedwig of Anhalt | 
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Issue more... | Christian, Duke of Schleswig-Holstein-Sonderburg-Ærø Alexander, Duke of Schleswig-Holstein-Sonderburg John Adolph, Duke of Schleswig-Holstein-Sønderburg-Norburg Elisabeth, Duchess of Pomerania Frederick, Duke of Schleswig-Holstein-Sonderburg-Norburg Margaret, Countess of Nassau-Siegen Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg Joachim Ernest, Duke of Schleswig-Holstein-Sonderburg-Plön Eleonore Sophie of Schleswig-Holstein-Sonderburg | 
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| House | Oldenburg | 
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| Father | Christian III of Denmark | 
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| Mother | Dorothea of Saxe-Lauenburg | 
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John the Younger (Danish: Hans; German: Johann; 25 March 1545 – 9 October 1622) was the duke of Schleswig-Holstein-Sonderburg.