Roman emperor
The Western Roman Empire collapsed in the late 5th century. Romulus Augustulus is often considered to be the last emperor of the West after his forced abdication in 476, although Julius Nepos maintained a claim recognized by the Eastern Empire to the title until his death in 480. Following Nepos' death, the Eastern Emperor Zeno abolished the division of the position and proclaimed himself as the sole Emperor of a reunited Roman Empire. The Eastern imperial lineage continued to rule from Constantinople ("New Rome"); they continued to style themselves as Emperor of the Romans (later βασιλεύς Ῥωμαίων in Greek), but are often referred to in modern scholarship as Byzantine emperors. Constantine XI Palaiologos was the last Roman emperor in Constantinople, dying in the Fall of Constantinople to the Ottomans in 1453.
Italian unification
The Habsburg rule in Italy came to an end with the campaigns of the French Revolutionaries in 1792–97, when a series of client republics were set up. In 1806, the Holy Roman Empire was dissolved by the last emperor, Francis II, after its defeat by Napoleon at the Battle of Austerlitz. The Italian campaigns of the French Revolutionary Wars destroyed the old structures of feudalism in Italy and introduced modern ideas and efficient legal authority; it provided much of the intellectual force and social capital that fueled unification movements for decades after it collapsed in 1814. The French Republic spread republican principles, and the institutions of republican governments promoted citizenship over the rule of the Bourbons and Habsburgs and other dynasties. The reaction against any outside control challenged Napoleon's choice of rulers. As Napoleon's reign began to fail, the rulers he had installed tried to keep their thrones (among them: Eugène de Beauharnais, viceroy of Italy and Joachim Murat, king of Naples) further feeding nationalistic sentiments. Beauharnais tried to get Austrian approval for his succession to the new Kingdom of Italy, and on 30 March 1815, Murat issued the Rimini Proclamation, which called on Italians to revolt against their Austrian occupiers.