Vem gifte sig med Maria Beatrice d'Este?

Maria Beatrice Ricciarda d'Este, född 7 april 1750 i Modena, Hertigdömet Modena och Reggio, död 14 november 1829 i Wien, Österrike, var regerande hertiginna av Massa och Carrara mellan 1790 och 1797, och mellan 1816 och 1829.

Archduke Ferdinand Karl of Austria-Este (Ferdinand Karl Anton Joseph Johann Stanislaus; 1 June 1754 – 24 December 1806) was the son of Holy Roman Emperor Francis I and Maria Theresa of Austria. He was the founder of the House of Austria-Este and Governor of the Duchy of Milan between 1765 and 1796. He was also designated as the heir to the Duchy of Modena and Reggio, but he never reigned, owing to the Napoleonic Wars.