Princess Maria Pia of Bourbon-Parma
Princess Maria Pia of Bourbon- Parma( née Princess Maria Pia of Savoy; born 24 September 1934) is the eldest daughter of Umberto II of Italy and Marie- José of Belgium.
She is the older sister of Princess Maria Gabriella of Savoy, Vittorio Emanuele, Prince of Naples, and Princess Maria Beatrice of Savoy.
Princess Elisabeth Anna of Prussia
Princess Elisabeth Anna of Prussia (8 February 1857 – 28 August 1895) was a German princess.
She was the second child of Prince Frederick Charles of Prussia and Princess Maria Anna of Anhalt-Dessau.
The Elisabeth-Anna-Palais was named in her honor after her early death in 1895.
Maria Anna of Savoy, Duchess of Chablais
Maria Anna of Savoy ("Maria Anna Carolina Gabriella"; 17 December 1757 – 11 October 1824) was a Princess of Savoy by birth and Duchess of Chablais by her marriage to her uncle, Prince Benedetto, Duke of Chablais.
Prince Benedetto, Duke of Chablais
Benedetto of Savoy (Benedetto Maria Maurizio; 21 June 1741 – 4 January 1808) was an Italian nobleman and military leader, who was prince of Savoy and Duke of Chablais.
He was born in the reign of his father Charles Emmanuel III, King of Sardinia.
He married his niece and was the owner of the "Palazzo Chiablese" in Turin; the two did not have descendants.
Maria Anna of Bavaria (1805–1877)
Princess Maria Anna of Bavaria (27 January 1805 – 13 September 1877) was Queen Consort of Saxony from 1836 to 1854.
Frederick Augustus II, Grand Duke of Oldenburg
Frederick Augustus II( 16 November 1852 in Oldenburg – 24 February 1931 in Rastede) was the last ruling Grand Duke of Oldenburg.
He married Princess Elisabeth Anna of Prussia, daughter of Princess Maria Anna of Anhalt- Dessau and Prince Frederick Charles of Prussia.
After her death, he married Elisabeth Alexandrine of Mecklenburg- Schwerin.
Archduchess Maria Anna of Austria (1610–1665)
Archduchess Maria Anna of Austria( German:" Maria Anna von Habsburg, Erzherzogin von Österreich", also known as" Maria Anna von Bayern" or" Maria- Anna, Kurfürstin von Bayern"; 13 January 1610 – 25 September 1665), was a German regent, Electress of Bavaria by marriage to Maximilian I, Elector of Bavaria, and co-regent of the Electorate of Bavaria during the minority of her son Ferdinand Maria, Elector of Bavaria from 1651 to 1654.
Princess Maria Anna Victoria of Savoy
Princess Maria Anna Victoria of Savoy (11 September 1683 – 11 October 1763) was the daughter of Prince Louis Thomas of Savoy, Count of Soissons, and Uranie de La Cropte de Beauvais.
Princess Maria Anna of Anhalt-Dessau
Princess Maria Anna of Anhalt- Dessau( 14 September 1837, Dessau – 12 May 1906, Friedrichroda) was a princess from the House of Ascania.
She was the third child of Leopold IV, Duke of Anhalt and Princess Frederica of Prussia.
Princess Maria Josepha of Saxony (1867–1944)
Princess Maria Josepha of Saxony( 31 May 1867 – 28 May 1944) was the mother of Emperor Charles I of Austria and the fifth child of George of Saxony and Infanta Maria Anna of Portugal.

Question: When did Maria Anna Of Savoy, Duchess Of Chablais's husband die?
Answer: 4 January 1808