William IV, Grand Duke of Luxembourg
| William IV | |
|---|---|
 |
|
| Grand Duke of Luxembourg | |
| Reign | 17 November 1905 – 25 February 1912 |
| Predecessor | Adolphe |
| Successor | Marie-Adélaïde |
| Regent |
Marie Anne of Portugal (1908–1912) |
| Born |
22 April 1852 Biebrich Palace, Wiesbaden |
| Died | 25 February 1912 (aged 59) Berg Castle, Colmar-Berg |
| Burial | Schlosskirche ("Castle Church") in Weilburg since 1953 |
| 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 Elisabeth, Princess Ludwig Philipp of Thurn and Taxis Sophie, Princess Ernst Heinrich of Saxony |
| House | Nassau-Weilburg |
| Father | Adolphe, Grand Duke of Luxembourg |
| Mother | Princess Adelheid-Marie of Anhalt-Dessau |
William IV (22 April 1852 – 25 February 1912) reigned as the sovereign Grand Duke of Luxembourg from 17 November 1905 until his death. He succeeded his father, Adolphe, Grand Duke of Luxembourg. He also held the title of Duke of Nassau, although that was annexed by Prussia after the Austro-Prussian war of 1866.
William IV 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 since William IV all other Grand Dukes 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 have reigned until the present day.
He was 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:
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