"Napoléon François Joseph Charles Bonaparte (20 March 1811 – 22 July 1832), Prince Imperial, King of Rome, known in the Austrian court as Franz from 1814 onward, Duke ...
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of Reichstadt from 1818, was the son of Napoleon, Emperor of the French, and his second wife, Archduchess Marie Louise of Austria.
By Title III, article 9 of the French Constitution of the time, he was Prince Imperial, but he was also known from birth as the King of Rome, which Napoleon I declared was the courtesy title of the heir apparent. His nickname of L´Aiglon ("the Eaglet") was awarded posthumously and was popularized by the Edmond Rostand play, L´Aiglon." - (en.wikipedia.org 05.11.2019)
