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 Sophie of Sweden
In 1815, she was engaged, and on 25 July 1819 in Karlsruhe, Sophie married her half-grand-uncle Prince Leopold of Baden, the son of a morganatic marriage. The marriage with Leopold had been specifically arranged by her uncle, Grand Duke Karl I of Baden, to improve the chances that Leopold would one day succeed him as grand duke because of Sophie's royal lineage; Leopold, though his right to the throne was recognized, was originally the issue of a morganatic marriage. During the reign of Louis I, Grand Duke of Baden, they lived a modest life away from court, as Louis did not want the heir to the throne at court. In 1830, her husband ascended to the grand ducal throne as Leopold I, and Sophie became Grand Duchess of Baden.