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 of Pomerania
Sophie of Pomerania (1498–1568) was queen of Denmark and Norway as the spouse of Frederick I. She is known for her independent rule over her fiefs Lolland and Falster, the castles in Kiel and Plön, and several villages in Holstein as queen.