Ernest Augustus I, Duke of Saxe-Weimar-Eisenach
Ernest Augustus I, Duke of Saxe- Weimar( German:" Ernst August I"; 19 April 1688 – 19 January 1748), was a duke of Saxe- Weimar and, from 1741, of Saxe- Weimar- Eisenach.
Princess Amalia of Saxe-Weimar-Eisenach
Princess Amalia Maria da Gloria Augusta of Saxe-Weimar-Eisenach (20 March 1830 — 1 May 1872) was the first wife of Prince Henry of the Netherlands, son of king William II of the Netherlands.
Princess Marie of Saxe-Weimar-Eisenach (1808–1877)
Princess Marie of Saxe- Weimar- Eisenach( 3 February 1808 in Weimar – 18 January 1877 in Berlin) was a princess of Saxe- Weimar- Eisenach, by birth, and, by marriage, a princess of Prussia.
She was the daughter of Charles Frederick, Grand Duke of Saxe- Weimar- Eisenach and Grand Duchess Maria Pavlovna of Russia.
Prince Bernhard of Saxe-Weimar-Eisenach (1878–1900)
Prince Bernhard of Saxe-Weimar-Eisenach ("Bernhard Carl Alexander Hermann Heinrich Wilhelm Oscar Friedrich Franz Peter"; 18 April 1878 – 1 October 1900) was a member of the Grand Ducal House of Saxe-Weimar-Eisenach and a Lieutenant in the Prussian Army.
He bore the titles "Prince of Saxe-Weimar-Eisenach, Duke of Saxony" with the style "Highness".
Michael, Prince of Saxe-Weimar-Eisenach
Michael, Prince of Saxe- Weimar- Eisenach( born 15 November 1946) is the current head of the Grand Ducal House of Saxe- Weimar- Eisenach, as well as the most senior agnate of the entire House of Wettin.
Prince Wilhelm of Saxe-Weimar-Eisenach
Prince Wilhelm Karl Bernhard Hermann of Saxe- Weimar- Eisenach( 21 December 1853 – 15 December 1924) was a member of the House of Saxe- Weimar- Eisenach.
Ernest Augustus II, Duke of Saxe-Weimar-Eisenach
Ernst August II Konstantin, Duke of Saxe- Weimar- Eisenach( 2 June 1737 – 28 May 1758), was a duke of Saxe- Weimar- Eisenach.
Prince Hermann of Saxe-Weimar-Eisenach (1886–1964)
Prince Hermann of Saxe- Weimar- Eisenach( 14 February 1886 – 6 June 1964) was a member of the House of Saxe- Weimar- Eisenach.
He was heir to his relative William Ernest, Grand Duke of Saxe- Weimar- Eisenach until 1909, when he was disinherited of his royal status.
From that point onwards, Hermann was commonly referred to with the lesser style, Count Ostheim.
Princess Pauline of Saxe-Weimar-Eisenach
Princess Pauline of Saxe- Weimar- Eisenach( Pauline Ida Marie Olga Henriette Katherine; 25 July 1852, in Stuttgart – 17 May 1904, in Orte) was the wife of Charles Augustus, Hereditary Grand Duke of Saxe- Weimar- Eisenach.
She was a daughter of Prince Hermann of Saxe- Weimar- Eisenach and Princess Augusta of Württemberg.
Prince Henry of the Netherlands (1820–1879)
Prince William Frederick Henry of the Netherlands
(Dutch:
Willem Frederik Hendrik; 13 June 1820 – 14 January 1879) was the third son of King William II of the Netherlands and his wife, Grand Duchess Anna Pavlovna of Russia.
He was born at Soestdijk Palace.
Prince Henry became Governor of Luxembourg in 1850, in which capacity he served until his death in 1879.
During his tenure, he worked with the government to launch the reactionary Coup of 1856, which consolidated power in the monarchy and the executive.
However, most of the changes were reversed by the new constitution issued in 1868 after the 1867 Luxembourg Crisis, during which the crown tried to sell the grand duchy to France.

Question: When did Princess Amalia Of Saxe-Weimar-Eisenach's husband die?
Answer: 14 January 1879