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 Sophie of Saxe-Weimar-Eisenach (1911–1988)
Though the passports were released, Sophie for unknown reasons revoked her acceptance and stated she could no longer attend the wedding at the last moment. Plans for the ceremony continued regardless, with Juliana getting married on 7 January 1937. Princess Sophie was replaced as bridemaid by Baroness von Heeckeren van Kell, one of Juliana's ladies-in-waiting.