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:
Infanta Maria Doroteia of Portugal
Doroteia was born in September 1739 in Lisbon and was the third of four daughters of King Joseph. She was named after her great-grandmother, Dorothea Sophie of Neuburg. She was a proposed bride for Philippe d'Orléans, Duke of Orléans (later known as "Philippe Égalité"), but she refused to marry him.