About Frederica of Mecklenburg-Strelitz
Frederica of Mecklenburg-Strelitz (German: Friederike Luise Caroline Sophie Alexandrine; 3 March 1778 – 29 June 1841) was Queen of Hanover from 20 June 1837 until her death in 1841 as the wife of King Ernest Augustus. She was a German princess who married successively Prince Louis Charles of Prussia, Prince Frederick William of Solms-Braunfels, and her first cousin Ernest Augustus. Through her 1815 marriage to Ernest, then Duke of Cumberland, Frederica became a British princess and Duchess of Cumberland. Ernest was the fifth son and eighth child of Queen Charlotte and King George III of the United Kingdom, Frederica's paternal aunt and her husband. Frederica was born in the Altes Palais of Hanover as the fifth daughter of Charles II, Duke of Mecklenburg-Strelitz, and Princess Friederike of Hesse-Darmstadt. Her father assumed the title of Grand Duke of Mecklenburg on 18 June 1815. Queen Frederika Louisa of Hesse-Darmstadt, wife of King Frederick William II, was a first cousin of Frederica's mother.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.