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 of Württemberg
She was born in Stuttgart; her parents were King William I of Württemberg and Grand Duchess Catherine Pavlovna of Russia, the fourth eldest daughter of Tsar Paul I. Sophie and William were first cousins as their mothers were sisters. Shortly after Sophie’s birth, her mother died, and she was cared for by her aunt, Catharina of Württemberg. She was niece of tsars Alexander I and Nicholas I of Russia and a cousin of Tsar Alexander II, George V of Hanover and England's Queen Victoria.