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 Maria Vittoria of Savoy
Maria married Prince Leopold of the Two Sicilies, known as the Count of Syracuse. The count was the fifth son of Francis I of the Two Sicilies and his second wife the Infanta Maria Isabel of Spain. Maria Vittoria and Leopold were married on 16 June 1837 in Naples. Maria and Leopold had one daughter who died a day after her birth.