Louis I, Grand Duke of Hesse
In 1776, he became engaged to Sophie Dorothea of Württemberg, eldest daughter of Frederick II Eugene, Duke of Württemberg. The engagement was broken off so that Sophia Dorothea could marry Louis's recently widowed brother-in-law Tsarevich Paul Petrovich, son and heir of Catherine II "the Great", Empress of Russia. He received a monetary compensation when the engagement was broken.
Duchess Sophie Adelheid in Bavaria
Her parents were Karl Theodor, Duke in Bavaria, head of a cadet branch of the Bavarian royal family, and an ophthalmologist of recognized reputation, and his second wife, the Infanta Maria José of Braganza, third daughter of King Miguel I, exiled monarch of Portugal. Her paternal aunt was Empress Elisabeth of Austria ("Sissi"). She was also the sister of Queen Elisabeth of the Belgians, consort of Albert I and of Marie Gabrielle, wife of the last crown prince of Bavaria, Rupprecht, later the head of the House of Wittelsbach. She was named after her father's first wife, Princess Sophie of Saxony, the mother of her half-sister Amalie.