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.
Augusta of Saxe-Weimar-Eisenach
Augusta was the second daughter of Charles Frederick, Grand Duke of Saxe-Weimar-Eisenach and Maria Pavlovna of Russia, a daughter of Paul I of Russia and Sophie Dorothea of Württemberg.