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:
Sophie, Duchess of Hohenberg
Sophie and Franz Ferdinand were married on 1 July 1900 at Reichstadt (now Zákupy) in Bohemia. The Emperor did not attend the nuptials, nor did any of the archdukes, including Franz Ferdinand's brothers. The only members of the Imperial family who were present were Franz Ferdinand's stepmother, Archduchess Maria Theresa, and her two daughters.
Upon her marriage, Sophie was given the title "Fürstin von Hohenberg" ("Princess of Hohenberg") with the style of "Durchlaucht" ("Serene Highness"). In 1909, she was elevated to "Herzogin" (Duchess) and accorded the higher style of "Hoheit" ("Highness").