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:
Archduke Joseph Franz of Austria
He was the seventh child born to his parents: Marie Louise was born in 1791, and later became Empress consort of the French, as wife of Napoleon I Bonaparte; Ferdinand was born in 1793 and later became Emperor of Austria, but was dethroned due to the fact that he was severely (mentally and physically) disabled; Marie Caroline was born in 1794, but died less than a year later in 1795; Caroline Ludovika was born in 1795, but died two years later in 1797; Marie Leopoldina was born in 1797 and became the first Empress consort of Brazil, as the wife of Pedro I of Brazil; and, finally, Clementina was born in 1798 and became Princess of Salerno, as the wife of Leopold, Prince of Salerno.