|Grand Duke of Luxembourg|
|Reign||17 November 1905 – |
25 February 1912
|Regent||Marie Anne of Portugal|
|Born||22 April 1852|
Biebrich Palace, Wiesbaden, Duchy of Nassau
|Died||25 February 1912 (aged 59)|
Berg Castle, Colmar-Berg, Luxembourg
|Spouse||Marie Anne of Portugal|
|Issue||Marie-Adélaïde, Grand Duchess of Luxembourg|
Charlotte, Grand Duchess of Luxembourg
Hilda, Princess of Schwarzenberg
Antonia, Crown Princess of Bavaria
|Father||Adolphe, Grand Duke of Luxembourg|
|Mother||Princess Adelheid-Marie of Anhalt-Dessau|
William IV (William Alexander; French: Guillaume Alexandre; 22 April 1852 – 25 February 1912) reigned as the Grand Duke of Luxembourg from 17 November 1905 until his death. He succeeded his father, Adolphe.
William was a Protestant, the religion of the House of Nassau. He married Princess Marie Anne of Portugal, believing that a Roman Catholic country ought to have a Roman Catholic monarch. Thus his heirs have been Catholic.
At the death of his uncle, Prince Nikolaus-Wilhelm in 1905, the only other legitimate male in the House of Nassau-Weilburg was William's cousin, Georg Nikolaus, Count of Merenberg, the product of a morganatic marriage. So in 1907, William declared the Counts of Merenberg non-dynastic, naming his own eldest daughter Marie-Adélaïde (1894–1924) as heir presumptive to the grand ducal throne. She became Luxembourg's first reigning grand duchess upon her father's death in 1912, and upon her own abdication in 1919, was succeeded by her younger sister Charlotte (1896–1985). Charlotte's descendants reign until the present day.
To date, William is the last monarch of Luxembourg to die whilst still on the throne.
On 21 June 1893 in Fischhorn Castle, Zell am See, he married Infanta Marie Anne of Portugal, daughter of the deposed king Miguel I of Portugal and Adelaide of Löwenstein-Wertheim-Rosenberg. The couple had six daughters:
- Marie-Adélaïde, Grand Duchess of Luxembourg (1894–1924) who remained unmarried and childless
- Charlotte, Grand Duchess of Luxembourg (1896–1985) who married her first cousin Prince Felix of Bourbon-Parma, a son of Marie Anne's younger sister.
- Princess Hilda (15 February 1897 in Berg Castle – 8 September 1979 in Berg Castle), married in Berg Castle on 29 October 1930 Adolf 10th Prince of Schwarzenberg (18 August 1890 in Frauenberg – 27 February 1950 in Bordighera), without issue
- Crown Princess Antonia of Bavaria (1899–1954), who married Crown Prince Rupprecht of Bavaria as his second wife
- Princess Elisabeth (7 March 1901 in Luxembourg – 2 August 1950 in Schloss Hohenburg), married in Schloss Hohenburg on 14 November 1922 Prince Ludwig Philipp of Thurn and Taxis (2 February 1901 in Regensburg – 22 April 1933 in Schloss Niederaichbach), son of Albert I, Prince of Thurn and Taxis, and had issue
- Princess Sophie (14 February 1902 in Berg Castle – 24 May 1941 in Munich), married at Schloss Hohenburg on 12 April 1921 Prince Ernst Heinrich of Saxony (9 December 1896 in Dresden – 14 June 1971 in Neckarhausen), youngest son of king Frederick Augustus III of Saxony, and had issue
Titles and honours
Although the duchy of Nassau was annexed by Prussia after the Austro-Prussian war of 1866, the title of Duke of Nassau was retained by William and his heirs. This does not imply any sovereignty over Nassau.
- 22 April 1852 - 23 November 1890: His Highness The Hereditary Prince of Nassau
- 23 November 1890 - 17 November 1905: His Royal Highness The Hereditary Grand Duke of Luxembourg, Hereditary Prince of Nassau
- 17 November 1905 - 25 February 1912: His Royal Highness The Grand Duke of Luxembourg, Duke of Nassau
- Grand Master and Knight of the Order of the Gold Lion of the House of Nassau
- Grand Master of the Order of Adolphe of Nassau
- Grand Master of the Order of the Oak Crown
- Duchy of Anhalt: Knight Grand Cross of the Order of Albert the Bear - 1868
- Austria-Hungary: Grand Cross of the Order of St. Stephen of Hungary - 1890
- Kingdom of Bavaria: Knight of the Order of St. Hubert - 1892
- Brunswick: Knight Grand Cross of the Order of Henry the Lion - 1873
- Denmark: Knight of the Order of the Elephant - 23 April 1876
- Netherlands: Knight Grand Cross of the Order of the Netherlands Lion
- Saxe-Weimar-Eisenach: Knight Grand Cross of the Order of the White Falcon - 1890
- Sweden-Norway: Knight of the Royal Order of the Seraphim - 19 June 1889
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|Ancestors of William IV, Grand Duke of Luxembourg|
Notes and references
- Theroff, Paul. "Princely House of Schwarzenberg". www.angelfire.com/realm/gotha/ (Paul Theroff’s Royal Genealogy Site).[self-published source][better source needed] 
- Theroff, Paul. "Princely House of Thurn and Taxis". www.angelfire.com/realm/gotha/ (Paul Theroff’s Royal Genealogy Site).[self-published source][better source needed] 
- Theroff, Paul. "Royal House of Saxony". www.angelfire.com/realm/gotha/ (Paul Theroff’s Royal Genealogy Site).[self-published source][better source needed] 
- Almanach de Gotha (1901), article "Luxembourg"
- It was customary for a reigning Duke, his heir apparent, and their spouses to use the style of Highness.
- It was customary for a reigning Grand Duke, his heir apparent, and their spouses to use the style of Royal Highness
- Hof- und Staats-Handbuch für des Herzogtum Anhalt (1883), "Herzoglicher Haus-Orden Albrecht des Bären" p. 16
- "A Szent István Rend tagjai" Archived 22 December 2010 at the Wayback Machine
- Hof- und Staats-Handbuch des Großherzogtum Baden (1896), "Großherzogliche Orden" pp. 62, 77
- Hof- und Staats-Handbuch des Königreich Bayern (1908), "Königliche Orden" p. 8
- Hof- und Staatshandbuch des Herzogtums Braunschweig für das Jahr 1908. Braunschweig 1908. Meyer. p. 9
- Jørgen Pedersen (2009). Riddere af Elefantordenen, 1559–2009 (in Danish). Syddansk Universitetsforlag. p. 288. ISBN 978-87-7674-434-2.
- Staatshandbuch für das Großherzogtum Sachsen / Sachsen-Weimar-Eisenach (1900), "Großherzogliche Hausorden" p. 16
- Sveriges statskalender (in Swedish), 1905, p. 440, retrieved 2018-01-06 – via runeberg.org
William IV, Grand Duke of Luxembourg
Cadet branch of the House of NassauBorn: 12 April 1852 Died: 25 February 1912
| Grand Duke of Luxembourg