Why did Napoleon empire fall?
First French Empire
Following his retreat from Russia, Napoleon continued to retreat, this time from Germany. After the loss of Spain, reconquered by an allied army led by Wellington, the rising in the Netherlands preliminary to the invasion and the manifesto of Frankfort (1 December 1813) which proclaimed it, he had to fall back upon the frontiers of 1795; and then later was driven yet farther back upon those of 1792—despite the brilliant campaign of 1814 against the invaders. Paris capitulated on 30 March 1814, and the "Delenda Carthago", pronounced against Britain, was spoken of Napoleon. The Empire briefly fell with Napoleon's abdication at Fontainebleau on 11 April 1814.
Siege of Ancona
As a result of the expulsion of the French, there arose a power vacuum in Italy. The Italians adamantly refused to support anyone who came in the name of Napoleon. Unification of Italy was Murat’s ideal. Murat was an Italian prince who supported Napoleon’s bid for power in Italy. As a result of anti-Napoleon sentiment, Murat’s attempt to install a Bonaparte monarchy even after the defeat of Napoleon failed to gain traction. His attempt to establish a monarchy in Italy was rejected, and the Bonaparte royalty was completely deposed by the English in Naples at the same time as the end of the siege of Ancona; the 30th May, 1815. Murat had earlier been defeated in battle by the Austrians on the 3rd May 1815 at Tolentino. Unfortunately, this meant that the constitution he proposed before his defeat never took hold. However, his ideals of an independent Italy played a role in the Risorgimento, decades later.