"Elisabeth Christine Ulrike of Brunswick-Wolfenbüttel (Elisabeth Christine Ulrike; 8 November 1746 – 18 February 1840), was a Crown Princess of Prussia as the first wife of Crown Prince Frederick William, her cousin and the future king Frederick William II of Prussia.
She was the seventh child and third daughter of Charles I, Duke of Brunswick-Lüneburg and Princess Philippine Charlotte of Prussia, the sister of Frederick the Great. She held the rank of Duchess in Brunswick with the style and title Her Serene Highness Princess Elisabeth Christine." - (en.wikipedia.org 08.11.2019)
)