John the Younger or John of Denmark was the duke of Schleswig-Holstein-Sonderburg. Wikipedia
Born: March 25, 1545, Haderslev, Denmark
Died: October 9, 1622 (age 77 years), Glücksburg, Germany
Parents: Christian III of Denmark and Dorothea of Saxe-Lauenburg
Great-grandparents: Christian I of Denmark, Dorothea of Brandenburg, John Cicero, Elector of Brandenburg, and more
Grandparents: Frederick I of Denmark, Anna of Brandenburg, Magnus I, Duke of Saxe-Lauenburg, and more