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.
Battle of Pollentia
Theodosius I, the last emperor of both eastern and western halves of the Roman Empire, died in 395, leaving his sons Arcadius and Honorius emperors of the East and West, respectively. However, the weakness of character of the two brothers, and their young age upon their accession to the throne, made it possible for ambitious and sometimes unscrupulous ministers to assume the effective rule of the Empire.