On 17 March 1831, while fleeing Italy due to a crackdown on revolutionary activity by Papal and Austrian troops, Napoléon Louis, suffering from measles, died in the arms of his brother in Forlì.
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In the next year he appointed his infant nephew, Prince Napoleon Louis Bonaparte (1804–1831), the elder son of Napoleon's brother Louis Bonaparte, King of Holland, Grand Duke of Berg; French bureaucrats under Pierre Louis Roederer administered the territory in his name.