Question: When was Prince Frederick William Of Solms-Braunfels's wife born?

Knowledge 1: Prince Frederick William of Solms-Braunfels
Prince Frederick William of Solms-Braunfels (22 October 1770 in Braunfels – 13 April 1814 in Slawentzitz) was a Prussian Major General.He was the fourth son of Ferdinand William Ernest, 2nd Prince of Solms-Braunfels (1721–1783) and Countess Sophie Christine Wilhelmine of Solms-Laubach (1741–1772).He became known mainly through his marriage to Princess Frederica of Mecklenburg-Strelitz.She was the widow of Prince Louis Charles of Prussia (1773–1796).When she became pregnant in 1798, he married her in order to avoid a scandal.The daughter died soon after birth.Frederick William was alleged to have been strongly inclined to consume alcohol and had to quit military service in 1805 for health reasons.He also lost his income and even his brother advised Frederica to divorce.She was initially against it, but when in 1813, she met Ernest Augustus, King of Hanover (1771–1851), she, too, wanted the divorce.Before they got around to it, however, Frederick William died, in 1814 in Sławięcice. [SEP] Knowledge 2: Frederica of Mecklenburg-Strelitz
Frederica of Mecklenburg-Strelitz ("Friederike Louise Caroline Sophie Charlotte Alexandrine") (3 March 1778 – 29 June 1841) was a German princess who became, by marriage, princess of Prussia, princess of Solms-Braunfels, Duchess of Cumberland in Britain and Queen of Hanover (in Germany) as the consort of Ernest Augustus, King of Hanover (the fifth son and eighth child of King George III).She was born in the "Altes Palais" of Hanover as the fifth daughter of Charles II, Duke of Mecklenburg-Strelitz, and his first wife, Frederica, daughter of Prince George William of Hesse-Darmstadt.Her father assumed the title of Grand Duke of Mecklenburg on 18 June 1815.Duchess Frederica was the niece of her future mother-in-law, Queen Charlotte, through her father.
Knowledge 1: Frederica of Mecklenburg-Strelitz
Frederica of Mecklenburg-Strelitz ("Friederike Louise Caroline Sophie Charlotte Alexandrine") (3 March 1778 – 29 June 1841) was a German princess who became, by marriage, princess of Prussia, princess of Solms-Braunfels, Duchess of Cumberland in Britain and Queen of Hanover (in Germany) as the consort of Ernest Augustus, King of Hanover (the fifth son and eighth child of King George III).She was born in the "Altes Palais" of Hanover as the fifth daughter of Charles II, Duke of Mecklenburg-Strelitz, and his first wife, Frederica, daughter of Prince George William of Hesse-Darmstadt.Her father assumed the title of Grand Duke of Mecklenburg on 18 June 1815.Duchess Frederica was the niece of her future mother-in-law, Queen Charlotte, through her father. [SEP] Knowledge 2: William, Prince of Solms-Braunfels
Wilhelm Christian Karl, 3rd Prince of Solms Braunfels (9 January 1759, in Braunfels – 20 March 1837, in Braunfels) was by succession an immediate Prince, then a nobleman and head of the Princely House of Solms-Braunfels, a Prussian major general and Hessian deputy.
Knowledge 1: Prince Frederick William of Solms-Braunfels
Prince Frederick William of Solms-Braunfels (22 October 1770 in Braunfels – 13 April 1814 in Slawentzitz) was a Prussian Major General.He was the fourth son of Ferdinand William Ernest, 2nd Prince of Solms-Braunfels (1721–1783) and Countess Sophie Christine Wilhelmine of Solms-Laubach (1741–1772).He became known mainly through his marriage to Princess Frederica of Mecklenburg-Strelitz.She was the widow of Prince Louis Charles of Prussia (1773–1796).When she became pregnant in 1798, he married her in order to avoid a scandal.The daughter died soon after birth.Frederick William was alleged to have been strongly inclined to consume alcohol and had to quit military service in 1805 for health reasons.He also lost his income and even his brother advised Frederica to divorce.She was initially against it, but when in 1813, she met Ernest Augustus, King of Hanover (1771–1851), she, too, wanted the divorce.Before they got around to it, however, Frederick William died, in 1814 in Sławięcice. [SEP] Knowledge 2: William, Prince of Solms-Braunfels
Wilhelm Christian Karl, 3rd Prince of Solms Braunfels (9 January 1759, in Braunfels – 20 March 1837, in Braunfels) was by succession an immediate Prince, then a nobleman and head of the Princely House of Solms-Braunfels, a Prussian major general and Hessian deputy.

Answer: 3 March 1778