Order of the Iron Crown (Austria)
The Holy Roman Empire, ruled by the Habsburg dynasty, gave way to the Empire of Austria between 1804 and 1806. The last Holy Roman Emperor, Franz II, was proclaimed Emperor Franz I of Austria. His daughter, the Archduchess Maria Louise, was Napoleon’s second wife and Empress Consort, and the mother of Napoleon’s only legitimate son and heir, Napoleon, Duke of Reichstadt. With the collapse of Napoleon’s empire, Imperial Austria regained its traditional control of Lombardy as the Kingdom of Lombardy–Venetia.
Romulus Augustulus
Some sources suggest that Julius Nepos claimed to hold legally the title of emperor when Odoacer took power. However, few of Nepos' contemporaries were willing to support his cause after he fled to Dalmatia. Some historians regard Julius Nepos, who ruled in Dalmatia until being murdered in 480, as the last lawful Western Roman Emperor.