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.
Sophie, Duchess of Hohenberg
Sophie, Duchess of Hohenberg (; ; 1 March 1868 – 28 June 1914), was the wife of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne. Their assassination in Sarajevo sparked a series of events that eventually led to World War I.