Who was the last leader of the Holy Roman Empire?
Early modern period
In the early modern period, the Holy Roman Empire was a union of territories in Central Europe under a Holy Roman Emperor the first of which was Otto I. The last was Francis II, who abdicated and dissolved the Empire in 1806 during the Napoleonic Wars. Despite its name, for much of its history the Empire did not include Rome within its borders.
German Question
On August 6, 1806, Habsburg Emperor Francis II had abdicated the throne of the Holy Roman Empire in the course of the Napoleonic Wars with France, thereby ending the loose Empire. Despite its later name affix "of the German Nation", the Holy Roman Empire had never been a nation state. Instead its rulers over the centuries had to cope with a continuous loss of authority to its constituent Imperial States. The disastrous Thirty Years' War proved especially fatal to the Holy Roman Emperor's authority, as the mightiest entities, the Austrian Habsburg Monarchy and Brandenburg-Prussia evolved into rivaling European absolute powers with territory reaching far beyond Imperial borders. The many small city-states splintered, meanwhile. In the 18th century the Holy Roman Empire consisted of over 1800 separate territories governed by distinct authorities.