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.
Princess Sophia of the United Kingdom
Conversely, Anthony Camp challenges the belief that Sophia had a child and provides a detailed summary of the available evidence. In his book "Royal Babylon: the Alarming History of European Royalty", author Karl Shaw writes of the possibility that the Duke raped his sister, citing evidence from Charles Greville's diaries, as well as other factors. Historian Gillian Gill believes that Sophia secretly gave birth to the child and that this is the reason Sophia never married. Alison Weir and others, however, write of a possible marriage between Sophia and Garth the same year as the child's birth, but there is no evidence to back this assertion other than the presence of a wedding ring in a portrait of an aged Sophia.