Alexander, Duke of Schleswig-Holstein-Sonderburg (20 January 1573 – 13 May 1627), was a Danish nobleman.
Alexander was born in Sønderborg (German: Sonderburg) in Schleswig, the third son of Johann II, Duke of Schleswig-Holstein-Sonderburg-Plon and Elisabeth of Brunswick-Grubenhagen. Because his elder surviving brother chose Ærø as his seat, Alexander received Sønderborg upon their father's death and was in practice its second duke. Alexander died in Sønderborg.
Alexander married Dorothea von Schwarzburg-Sondershausen, daughter of John Günther I, Count of Schwarzburg-Sondershausen, on 26 November 1604 in Oldenburg. They had eleven children:
- Johann Christian, Duke of Schleswig-Holstein-Sonderburg-Franzhagen (26 April 1607 - 28 June 1653)
- Alexander Heinrich, Duke of Schleswig-Holstein-Sonderburg (12 September 1608 - 5 September 1657)
- Ernest Günther, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (14 October 1609 - 18 January 1689)
- Georg Friedrich, Duke of Schleswig-Holstein-Sonderburg (18 December 1611 - 23 August 1676)
- August Philipp, Duke of Schleswig-Holstein-Sonderburg-Beck (11 November 1612 - 6 May 1675)
- Adolph, Duke of Schleswig-Holstein-Sonderburg (2 November 1613 - 1 February 1616)
- Anna Elisabeth, Duchess of Schleswig-Holstein-Sonderburg (5 February 1615 - 19 February 1616)
- Wilhelm Anton, Duke of Schleswig-Holstein-Sonderburg (2 April 1616 - 2 April 1616)
- Sophie Katharina, Duchess of Schleswig-Holstein-Sonderburg (28 June 1617 - 22 November 1696), wife of Anthony Günther, Count of Oldenburg
- Eleonore Sabine, Duchess of Schleswig-Holstein-Sonderburg (27 February 1619 - 27 February 1619)
- Philip Louis, Duke of Schleswig-Holstein-Sonderburg-Wiesenburg (27 October 1620 - 10 March 1689)
Ancestors
Ancestors of Alexander, Duke of Schleswig-Holstein-Sonderburg |
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| | | | | | | | | | | | | | | | | | | 16. Christian I of Denmark | | | | | | | | | 8. Frederick I of Denmark | | | | | | | | | | | | | 17. Dorothea of Brandenburg | | | | | | | | | 4. Christian III of Denmark | | | | | | | | | | | | | | | | 18. John Cicero, Elector of Brandenburg | | | | | | | | | 9. Anna of Brandenburg | | | | | | | | | | | | | 19. Margaret of Thuringia | | | | | | | | | 2. John II, Duke of Schleswig-Holstein-Sonderburg | | | | | | | | | | | | | | | | | | | 20. John V, Duke of Saxe-Lauenburg | | | | | | | | | 10. Magnus I, Duke of Saxe-Lauenburg | | | | | | | | | | | | | 21. Dorothea of Brandenburg | | | | | | | | | 5. Dorothea of Saxe-Lauenburg | | | | | | | | | | | | | | | | 22. Henry IV, Duke of Brunswick-Lüneburg | | | | | | | | | 11. Catherine of Brunswick-Wolfenbüttel | | | | | | | | | | | | | 23. Catherine of Pomerania | | | | | | | | | 1. Alexander, Duke of Schleswig-Holstein-Sonderburg | | | | | | | | | | | | | | | | | | | | | | 24. Albert II, Duke of Brunswick-Grubenhagen | | | | | | | | | 12. Philip I, Duke of Brunswick-Grubenhagen | | | | | | | | | | | | | 25. Elisabeth of Waldeck | | | | | | | | | 6. Ernest III, Duke of Brunswick-Grubenhagen | | | | | | | | | | | | | | | | 26. Ernest II of Mansfeld-Vorderort | | | | | | | | | 13. Catherine of Mansfeld-Vorderort | | | | | | | | | | | | | 27. Barbara of Querfurt | | | | | | | | | 3. Elisabeth of Brunswick-Grubenhagen | | | | | | | | | | | | | | | | | | | 28. Bogislaw X, Duke of Pomerania | | | | | | | | | 14. George I, Duke of Pomerania | | | | | | | | | | | | | 29. Anna of Poland | | | | | | | | | 7. Margaret of Pomerania-Wolgast | | | | | | | | | | | | | | | | 30. Philip, Elector Palatine | | | | | | | | | 15. Amalie of the Palatinate | | | | | | | | | | | | | 31. Margaret of Bavaria | | | | | | | |
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