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.
Archduchess Maria Anna of Austria (governor)
Archduchess Maria Anna of Austria(" Maria Anna Eleanor Wilhelmina Josepha"; 18 September 1718 in Vienna – 16 December 1744 in Brussels) was a member of the House of Habsburg who governed the Austrian Netherlands in the name of her elder sister, Empress Maria Theresa.
Maria Anna of Neuburg
Maria Anna of Neuburg( 28 October 1667 – 16 July 1740), was Queen of Spain from 1689 to 1700 as the second wife of Charles II, last Habsburg King of Spain.
Her marriage was dominated by the political struggle between French and Austrian factions over the Spanish throne, which resulted in the 1701 to 1714 War of the Spanish Succession.
When Charles died in 1700, he was succeeded by the French candidate, Philip V and Maria Anna was exiled.
She lived largely forgotten until her death in 1740.
Maria Anna Katharina Rutowska
Maria Anna Katharina Rutowska (1706–1746) was a Polish noblewoman.
She was the illegitimate daughter of Polish king Augustus II the Strong and his mistress, the Turk "Fatima or Fatime", later renamed Maria Anna of Spiegel.
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.
Archduchess Maria Anna of Austria (1770–1809)
Archduchess Maria Anna of Austria ("Maria Anna Ferdinanda Josepha Charlotte Johanna";
21 April 1770 – 1 October 1809) was an Archduchess of Austria by birth, and an Abbess at the Theresian Convent in Prague.
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.
Maria Anna of Austria
Maria Anna of Austria (Maria Anna Josepha Antonia Regina; 7 September 1683 – 14 August 1754) was Queen consort of Portugal by marriage to King John V of Portugal.
She was Regent of Portugal from 1742 until 1750 during the illness of John V.
Ferdinand III, Holy Roman Emperor
Ferdinand III (13 July 1608 – 2 April 1657) was Holy Roman Emperor from 15 February 1637 until his death, as well as King of Hungary and Croatia, King of Bohemia and Archduke of Austria.
Maria Anna of Spain
Infanta Maria Anna of Spain (18 August 1606 – 13 May 1646) was a Holy Roman Empress and Queen of Hungary and Bohemia by marriage to Ferdinand III, Holy Roman Emperor.
She acted as regent on several occasions during the absences of her spouse.
Daughter of King Philip III of Spain and Margaret of Austria, prior to her Imperial marriage she was considered a possible wife for Charles, Prince of Wales; the event, later known in history as the "Spanish Match", provoked a domestic and political crisis in the Kingdoms of England and Scotland.
In the imperial court in Vienna she continued to be strongly influenced by her native Spanish culture (from clothes to music) and also to promote the strengthening of relations between the Imperial and Spanish branches of the House of Habsburg.

Question: When did Maria Anna Of Spain's husband die?
Answer: 2 April 1657