Christoph, Duke of Württemberg
Christoph of Württemberg, Duke of Württemberg (12 May 1515 – 28 December 1568) ruled as Duke of Württemberg from 1550 until his death in 1568.
Duchess Elisabeth Alexandrine of Württemberg
Duchess Elisabeth Alexandrine Constance of Württemberg (27 February 1802 in Würzau, Courland Governorate – 5 December 1864, in Karlsruhe) was a daughter of Duke Louis of Württemberg and Princess Henriette of Nassau-Weilburg.
Duchess Elisabeth of Württemberg (b. 1933)
Duchess Elisabeth of Württemberg( born 2 February 1933) is a member of the House of Württemberg and a Duchess of Württemberg by birth and through her marriage to Prince Antoine of Bourbon- Two Sicilies, a member of the House of Bourbon- Two Sicilies and a Princess of Bourbon- Two Sicilies.
Princess Catherine of Württemberg
Princess Catherine Frederica Charlotte of Württemberg (Stuttgart, 24 August 1821 – Stuttgart, 6 December 1898) was a daughter of William I of Württemberg and Pauline Therese of Württemberg.
She was the mother of William II of Württemberg.
Princess Augusta of Württemberg
Princess Augusta of Württemberg( 4 October 1826 in Stuttgart – 3 December 1898, ibid.) was a daughter of King William I of Württemberg and his wife, Pauline of Württemberg.
Prince Frederick of Württemberg
Prince" Frederick" Charles Augustus of Württemberg( 21 February 1808 – 9 May 1870) was a General in the Army of Württemberg and the father of William II of Württemberg.
Frederick was a member of the Royal Family of Württemberg and a Prince of Württemberg.
Duchess Altburg of Oldenburg
Duchess Altburg Marie Matilda Olga of Oldenburg (19 May 1903 – 16 June 2001) was a daughter of Frederick Augustus II, Grand Duke of Oldenburg by his second wife Duchess Elisabeth Alexandrine of Mecklenburg-Schwerin
Princess Henriette of Nassau-Weilburg
Princess Henriëtte of Nassau-Weilburg, then of Nassau (22 April 1780, in Kirchheimbolanden – 2 January 1857, in Kirchheim unter Teck) was a daughter of Prince Charles Christian and Carolina of Orange-Nassau, daughter of William IV, Prince of Orange.
She is an ancestor of branches of the Austrian Imperial and Royal Family and Russian Imperial Family and Dutch Royal Family; the German Royal, Grand Ducal, Ducal, Princely and Princely noble families of: Baden, Bavaria, Hanover, Hohenlohe-Langenburg, Oldenburg, Salm-Salm, Saxe-Weimar-Eisenach, Waldeck and Pyrmont and Wied; in addition to the British, Greek, Romanian, Spanish and Yugoslavian Royal Families.
Duchess Elisabeth Alexandrine of Mecklenburg-Schwerin
Duchess Elisabeth Alexandrine of Mecklenburg- Schwerin( 10 August 1869 – 3 September 1955) was a daughter of Frederick Francis II, Grand Duke of Mecklenburg by his third wife Princess Marie of Schwarzburg- Rudolstadt.
By her marriage to Frederick Augustus II, she became the consort of the last reigning Grand Duke of Oldenburg.
Princess Alexandrine of Prussia (1842–1906)
Princess Frederica Wilhelmina Louise Elisabeth "Alexandrine" of Prussia (1 February 1842 – 26 March 1906) was a member of the House of Hohenzollern as the daughter of Prince Albert of Prussia and his wife Princess Marianne of the Netherlands.

Question: When is Duchess Elisabeth Alexandrine Of Württemberg's mother's birthday?
Answer: 22 April 1780