King of Rome
Napoleon's Son, the King of Rome (1811 - 1832) was the only legitimate child of Napoleon I and Maria Louisa of Austria (1791 - 1847). He was christened: Napoleon François-Joseph Charles. He was also known as the "Eaglet".
After Waterloo, Napoleon I abdicated in favor of his son. Napoleon II had only a short-lived regime, almost a theoretical reign. Later he was named the Duke of Reichstadt. His mother received then the life-title of Duchess of Parma (also of Piacenza, and Guastalla, Italy).
The young King of Rome was never a healthy child. He died at the age of 21 of tuberculosis on August 22, 1832, at Schönbrunn Palace in Austria.
- Napoleon II of France Answers.com