Archduke Maximilian of Austria-Este
Archduke Maximilian Joseph of Austria- Este( July 14, 1782 – June 1, 1863), the fourth son of Archduke Ferdinand of Austria- Este and younger brother of Francis IV, Duke of Modena.
He was grand master of the Teutonic Knights from 1835 to 1863.
Archduchess Maria Theresa of Austria (1845–1927)
Archduchess Maria Theresa of Austria (15 July 1845 – 8 October 1927) was a member of the Austrian house of Habsburg-Lorraine.
Victor Emmanuel I of Sardinia
Victor Emmanuel I (Vittorio Emanuele; 24 July 1759 – 10 January 1824) was the Duke of Savoy and King of Sardinia (1802–1821).
Maria Theresa of Austria-Este (1849–1919)
Maria Theresa of Austria-Este (Maria Theresa Henriette Dorothee; 2 July 1849 – 3 February 1919) was the last Queen of Bavaria.
She was the daughter and only child of Archduke Ferdinand of Austria-Este and his wife, Archduchess Elisabeth of Austria.
Archduchess Maria Theresa of Austria-Este (1817–1886)
Archduchess Maria Theresa of Austria-Este  (14 July 1817, Modena, Duchy of Modena and Reggio – 25 March 1886, Gorizia, Austria–Hungary) was a member of the House of Austria-Este and Archduchess of Austria, Princess of Hungary, Bohemia, and Modena by birth.
Henri was disputedly King of France and Navarre from 2 to 9 August 1830 and afterwards the Legitimist pretender to the throne of France from 1844 to 1883.
Maria Theresa was the eldest child of Francis IV, Duke of Modena and his niece-wife Maria Beatrice of Savoy.
Maria Theresa of Austria-Este, Queen of Sardinia
Maria Theresa of Austria-Este (Maria Theresia Josefa Johanna; 1 November 1773 – 29 March 1832) was born an archduchess of Austria-Este and a princess of Modena.
She was later queen of Sardinia as wife of Victor Emmanuel I of Sardinia.
Maria Ludovika of Austria-Este
Maria Ludovika of Austria- Este, also known as Maria Ludovika of Modena,( 14 December 1787 – 7 April 1816) was the daughter of Archduke Ferdinand of Austria- Este( 1754 – 1806) and his wife, Maria Beatrice Ricciarda d' Este( 1750 – 1829).
She was a member of the House of Austria- Este, a branch of the House of Habsburg- Lorraine.
Ferdinand Karl, Archduke of Austria-Este
Archduke Ferdinand Karl of Austria- Este( Ferdinand Karl Anton Joseph Johann Stanislaus; 1 June 1754 – 24 December 1806) was a son of Holy Roman Emperor Franz I and Maria Theresa of Austria.
He was the founder of the House of Austria- Este and Governor of the Duchy of Milan between 1765 and 1796.
He was also designated as the heir to the Duchy of Modena and Reggio, but he never reigned, owing to the Napoleonic Wars.
Fulgenzio Vitman
Fulgenzio Vitman( 1728–1806) was an Italian clergyman and botanist.
In 1774, he developed the Brera Botanical Garden in Milan out of a former Jesuit garden, under the direction of Maria Theresa of Austria.
Princess Elisabetta of Belgium
Princess Elisabetta of Belgium, Archduchess of Austria- Este( née" Nob." Elisabetta Rosboch von Wolkenstein on 9 September 1987) is the wife of Prince Amedeo of Belgium, Archduke of Austria- Este.

Question: When did Maria Theresa Of Austria-Este, Queen Of Sardinia's husband die?
Answer: 10 January 1824