Original: Napoléon François Joseph Charles ( Bonaparte ) , Duke of Reichstadt ( 20 March 181122 July 1832 ) , since 1818 known as Franz , Duke of Reichstadt , was the son of Napoleon I , Emperor of the French , and his second wife , Marie Louise of Austria .
Simplified: Napoléon François Joseph Charles Bonaparte , Duke of Reichstadt ( 1811 -- 1832 ) , was the son of Napoleon Bonaparte and his second wife , Marie Louise of Austria .