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:
Duke Paul Wilhelm of Württemberg
Paul Wilhelm married Princess Maria Sophia of Thurn and Taxis, fifth child and fourth daughter of Karl Alexander, 5th Prince of Thurn and Taxis and his wife Duchess Therese of Mecklenburg-Strelitz, on 17 April 1827 in Regensburg. Paul Wilhelm and Maria Sophia Dorothea had one son:He and Maria Sophia Dorothea divorced as early as 2 May 1835. After his marriage ended, Paul Wilhelm resided at Schloss Mergentheim in Mergentheim, where he kept his extensive ethnological collection acquired during his travels. In Bad Carlsruhe, Silesia, he built the palace, Palais "Paulusburg," but it was not completed until the year of his death.