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.
Sophia Dorothea of Celle
On 22 November 1682, in Celle, Sophia Dorothea married her cousin, George Louis. In 1705 he would inherit the Principality of Lüneburg after the death of his father-in-law and uncle, George William, Duke of Brunswick-Lüneburg, and in 1714 the Kingdom of Great Britain and the Kingdom of Ireland and became King George I of Great Britain through his mother, Duchess Sophia, a granddaughter of James VI and I.