Holy Roman Empire
The empire was dissolved on 6 August 1806, when the last Holy Roman Emperor Francis II (from 1804, Emperor Francis I of Austria) abdicated, following a military defeat by the French under Napoleon at Austerlitz (see Treaty of Pressburg). Napoleon reorganized much of the Empire into the Confederation of the Rhine, a French satellite. Francis' House of Habsburg-Lorraine survived the demise of the empire, continuing to reign as Emperors of Austria and Kings of Hungary until the Habsburg empire's final dissolution in 1918 in the aftermath of World War I.
Roman Catholic Archdiocese of Bologna
A detailed list of the various governments that have ruled Bologna is provided by Giovanni Battista Guidicini. In 1527, the Holy See became the absolute ruler of Bologna, and was represented by a "Legatus a latere" and a Vice-Legate. On 22 February 1530, Pope Clement VII crowned the Emperor Charles V as Holy Roman Empire, the last such event in history.