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.
Holy Roman Empire
The Army of the Holy Roman Empire (German "Reichsarmee", "Reichsheer" or "Reichsarmatur"; Latin "exercitus imperii") was created in 1422 and came to an end even before the Empire as the result of the Napoleonic Wars. It must not be confused with the Imperial Army ("Kaiserliche Armee") of the Emperor.