Elisabeth of Brunswick-Wolfenbüttel, Duchess of Saxe-Altenburg
Elisabeth of Brunswick- Wolfenbüttel( 23 June 1593 – 25 March 1650) was a princess of Brunswick- Wolfenbüttel and by marriage Duchess of Saxe- Altenburg.
Princess Augusta of Great Britain
Princess Augusta Frederica of Great Britain (31 July 1737 – 23 March 1813) was a British princess, granddaughter of King George II and the only elder sibling of King George III.
She was a Princess consort of Brunswick-Wolfenbuttel by marriage to Charles William Ferdinand, Prince of Brunswick-Wolfenbüttel.
Her daughter Caroline was the spouse of King George IV.
Princess Antoinette of Brunswick-Wolfenbüttel
Antoinette of Brunswick-Wolfenbüttel (Antoinette Amalie; 14 April 1696 – 6 March 1762) was a Duchess of Brunswick-Wolfenbüttel by marriage to Ferdinand Albert II of Brunswick-Wolfenbüttel.
She was the mother of the Queen of Prussia, the Duchess of Saxe-Coburg-Saalfeld and the Queen of Denmark and Norway.
Karl Georg August, Hereditary Prince of Brunswick-Wolfenbüttel
Karl Georg August, Hereditary Prince of Brunswick-Wolfenbüttel (8 February 1766 in London – 20 September 1806 in Antoinettenruh) was the heir to the Duchy of Brunswick as the eldest son of Charles William Ferdinand, Duke of Brunswick-Wolfenbüttel and Princess Augusta of Great Britain.
Leopold of Brunswick-Wolfenbüttel
Maximilian Julius Leopold of Brunswick- Wolfenbüttel, prince of Brunswick- Wolfenbüttel and nominal duke of Brunswick and Lüneburg( 12 October 1752, Wolfenbüttel- 27 April 1785, Frankfurt) was a Prussian general.
Duchess Luise of Brunswick-Wolfenbüttel
Luise of Brunswick- Wolfenbüttel( Luise Amalie; 29 January 1722 – 13 January 1780) was daughter of Ferdinand Albert II, Duke of Brunswick- Wolfenbüttel and his wife Duchess Antoinette of Brunswick- Wolfenbüttel.
Prince Ernest Augustus of Hanover (1914–1987)
Ernst August, Hereditary Prince of Brunswick, Prince of Hanover( 18 March 1914 – 9 December 1987) was head of the House of Hanover from 1953 until his death.
From his birth until the German Revolution of 1918 – 1919 he was the" Erbprinz"( Hereditary Prince) of the Duchy of Brunswick, a state of the German Empire.
He was born at Braunschweig, Germany, the eldest son of Ernest Augustus, Duke of Brunswick and Princess Viktoria Luise of Prussia, the only daughter of Emperor Wilhelm II, Ernest Augustus's third cousin in descent from George III of the United Kingdom.
Ernst August's parents were, therefore, third cousins, once removed.
From his birth, he was the" Hereditary Prince of Brunswick".
He was also, shortly after birth in 1914, made a British prince by King George V of the United Kingdom, and was heir to the titles Duke of Cumberland and Teviotdale and Earl of Armagh which were suspended under the Titles Deprivation Act 1917.
Princess Louise of Orange-Nassau
Princess Frederica" Louise" Wilhelmina of Orange- Nassau( 28 November 1770 – 15 October 1819) was a Hereditary Princess of Brunswick; married 14 October 1790 to Hereditary Prince Charles George August of Brunswick- Wolfenbüttel( 1766 – 20 September 1806), son of Charles William Ferdinand, Duke of Brunswick- Wolfenbüttel.
She was known in the family as" Loulou".
Charles William Ferdinand, Duke of Brunswick
Charles William Ferdinand, Duke of Brunswick-Lüneburg, Prince of Brunswick-Wolfenbüttel (9 October 1735 – 10 November 1806) was the Prince of Brunswick-Wolfenbüttel and Duke of Brunswick-Lüneburg and a military leader.
His titles are usually shortened to Duke of Brunswick in English-language sources.
He succeeded his father as sovereign prince of the Principality of Brunswick-Wolfenbüttel, one of the princely states of the Holy Roman Empire.
The duke was a cultured and benevolent despot in the model of Frederick the Great, and was married to Princess Augusta, a sister of George III of Great Britain.
He was also a recognized master of 18th century warfare, serving as a Field Marshal in the Prussian Army.
During the Napoleonic Wars, he was mortally wounded by a musket ball at the Battle of Jena–Auerstedt in 1806.
Princess Marie of Baden (1782–1808)
Marie of Baden(" Marie Elisabeth Wilhelmine"; 7 September 1782 – 20 April 1808) was a Duchess consort of Brunswick- Wolfenbüttel and Brunswick- Oels.
She was married to Frederick William, Duke of Brunswick- Wolfenbüttel, and was the daughter of Charles Louis, Hereditary Prince of Baden, and Landgravine Amalie of Hesse- Darmstadt.

Question: What is the date of death of Karl Georg August, Hereditary Prince Of Brunswick-Wolfenbüttel's mother?
Answer: 23 March 1813