Duchy of Modena and Reggio
Archduke Ferdinand Karl of Austria-Este (Ferdinand Karl Anton Joseph Johann Stanislaus; 1 June 1754 – 24 December 1806) was a son of Holy Roman Emperor Franz 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.