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:
Dorothea Maria of Saxe-Weimar, Duchess of Saxe-Zeitz
She married on 3 July 1656 in Weimar with Duke Maurice of Saxe-Zeitz, the youngest surviving son of Elector John George I of Saxony, from his second marriage, with Duchess Magdalene Sibylle of Prussia. They had ten children: