Princess Juliane of Saxe-Coburg-Saalfeld
Princess Juliane Henriette Ulrike of Saxe-Coburg-Saalfeld (Coburg, 23 September 1781 – Elfenau, near Bern, Switzerland, 15 August 1860), also known as Grand Duchess Anna Feodorovna of Russia , was a German princess of the ducal house of Saxe-Coburg-Saalfeld (after 1826, the house of Saxe-Coburg-Gotha) who became the wife of Grand Duke Konstantin Pavlovich of Russia.
Francis Josias, Duke of Saxe-Coburg-Saalfeld
Francis Josias, Duke of Saxe- Coburg- Saalfeld( 25 September 1697, in Saalfeld – 16 September 1764, in Rodach) was a duke of Saxe- Coburg- Saalfeld.
Christian Ernest II, Duke of Saxe-Coburg-Saalfeld
Christian Ernst II, Duke of Saxe-Coburg-Saalfeld (Saalfeld, 18 August 1683 – Saalfeld, 4 September 1745), was a duke of Saxe-Coburg-Saalfeld.
John Ernest IV, Duke of Saxe-Coburg-Saalfeld
Johann Ernest IV, Duke of Saxe- Coburg- Saalfeld( 22 August 1658 in Gotha – 17 February 1729 in Saalfeld) was a reigning duke of Saxe- Coburg- Saalfeld.
Princess Sophia Wilhelmina of Saxe-Coburg-Saalfeld
Princess Sophia Wilhelmina of Saxe- Coburg- Saalfeld( 9 August 1693, in Saalfeld – 4 December 1727, in Rudolstadt) was a Princess of Saxe- Coburg- Saalfeld by birth, and Princess of Schwarzburg- Rudolstadt by marriage.
Princess Frederica Caroline of Saxe-Coburg-Saalfeld
Princess Frederica Caroline of Saxe-Coburg-Saalfeld, Duchess in Saxony (24 June 1735 – 18 February 1791) was a princess of Saxe-Coburg-Saalfeld by birth and through marriage
the last Margravine of Brandenburg-Ansbach and Bayreuth.
Frederica Caroline was the fifth child and youngest daughter of Franz Josias, Duke of Saxe-Coburg-Saalfeld and Princess Anna Sophie of Schwarzburg-Rudolstadt (1700–1780), daughter of Louis Frederick I, Prince of Schwarzburg-Rudolstadt.
On 22 November 1754 in Coburg, she married Margrave Karl Alexander of Brandenburg-Ansbach and Bayreuth (1736-1806).
The marriage was concluded for dynastic reasons.
Although Frederica Caroline was considered virtuous, gentle, charitable and devout, her husband found her ugly, ignorant and boring.
The marriage remained childless, he separated from his wife, who by that time lived at Schwaningen Castle in Unterschwaningen, and began to live with his mistress Elizabeth Craven.
Frederica Caroline's brother, Prince Josias of Saxe-Coburg-Saalfeld, owed his sister admission to the regiment as captain, this starting point of his brilliant career military.
After Frederica Caroline's death, her husband abdicated as Margrave and sold the Margravate to Prussia, he left the country and married his English mistress that year.
Frederica Caroline is buried in the Gumbertuskirche in Ansbach.
Princess Charlotte Sophie of Saxe-Coburg-Saalfeld
Princess Charlotte Sophie of Saxe- Coburg- Saalfeld, Duchess in Saxony( 24 September 1731 – 2 August 1810) was a German duchess.
She was the daughter of Franz Josias, Duke of Saxe- Coburg- Saalfeld and Princess Anna Sophie of Schwarzburg- Rudolstadt.
Through his brother Ernest Frederick, Duke of Saxe- Coburg- Saalfeld, she was grandaunt of King Leopold I of Belgium and great- grandaunt of King Leopold II of Belgium, Empress Carlota of Mexico, Queen Victoria of the United Kingdom and her consort Prince Albert.
Princess Sophie of Saxe-Coburg-Saalfeld
Princess Sophie Friederike Karoline Luise of Saxe- Coburg- Saalfeld( 19 August 1778 – 9 July 1835) was a princess of Saxe- Coburg- Saalfeld, and the sister of Princess Victoria of Saxe- Coburg- Saalfeld and King Leopold I of Belgium, and aunt of Queen Victoria.
By marriage, she was a Countess of Mensdorff- Pouilly.
She was born in Coburg, the eldest child of Francis, Duke of Saxe- Coburg- Saalfeld and Countess Augusta Reuss of Ebersdorf.
Ernest Frederick, Duke of Saxe-Coburg-Saalfeld
Ernest Frederick, Duke of Saxe- Coburg- Saalfeld( 8 March 1724 in Saalfeld – 8 September 1800 in Coburg), was a Duke of Saxe- Coburg- Saalfeld.
Princess Anna Sophie of Schwarzburg-Rudolstadt
Princess Anna Sophie of Schwarzburg-Rudolstadt (9 September 1700 – 11 December 1780) was a Princess of Schwarzburg-Rudolstadt.
She was the daughter of
Louis Frederick I, Prince of Schwarzburg-Rudolstadt (15 October 1667 – 24 June 1718) and Anna Sophie of Saxe-Gotha-Altenburg (1670–1728).

Question: When did Princess Frederica Caroline Of Saxe-Coburg-Saalfeld's mother die?
Answer: 11 December 1780