Queen Charlotte: A Bridgerton Story depicts the young version of King George III, causing some to wonder why he became king at such a tender age. Queen Charlotte tells the story of one of Bridgerton's most notable characters, Charlotte of Mecklenburg-Strelitz, the wife of King George III of England and the longest reigning Queen Consort in British history. Queen Charlotte reigned as Queen Consort for more than 57 years during a period of political unrest that included both the French and American revolutions.
https://screenrant.com/bridgerton-queen-charlotte-george-king-young-age/