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 Charlotte of Hanover
Sophia Charlotte of Hanover (30 October 1668 – 1 February 1705) was the first Queen consort in Prussia as wife of King Frederick I. She was the only daughter of Elector Ernest Augustus of Brunswick-Lüneburg and his wife Sophia of the Palatinate. Her eldest brother George Louis succeeded to the British throne in 1714 as King George I.