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.
Dorothea Sophia, Abbess of Quedlinburg
She was the fourth child and second daughter of Friedrich Wilhelm I, Duke of Saxe-Weimar, and his first wife, Sophie of Württemberg.