Duke Ferdinand of Hungary (19 April 1793 - 29 June 1841) was the son of Francis I of Austria and, between 1814 and 1820, ruled the Duchy of Hungary, a nominally independent French vassal state carved out of the remains of the Austrian Empire after Napoleon annexed large parts of his father's western domains. He was referred to officially and colloquially as "Ferdinand the Austrian" and was recognized by some Hungarians as King Ferdinand V, although he was never officially styled in this manner as Napoleon abolished the crown of Hungary, rendering it a satellite duchy. He was the only of Francis I's children to remain in Europe following Napoleon's conquest of Austria and thus was effectively the last Hapsburg ruler in Europe, although many consider Napoleon's children to technically be Hap