William I of Württemberg
On 24 January 1816, in Saint Petersburg, he married his first cousin, Grand Duchess Catherine Pavlovna of Russia (1788–1819), daughter of Emperor Paul I of Russia (1754–1801) and Princess Sophie Dorothea of Württemberg (1759–1828). The couple had two children:
Princess Luise Dorothea of Prussia
Luise Dorothea was married in Berlin 31 May 1700 in a grand ceremony which took place during several weeks to great costs. Conrad Mel wrote "Font Legatio orientalis" at the occasion.
During her five years of marriage, Luise Dorothea suffered from poor health. She died in childbirth.