Simplify the following text for a Grade 12 native English-speaking person.
Original: Many Europeans , and Viennese in particular , suspected that he was actually fathered by Napoleon II ( son of Napoleon I and Marie Louise of Austria as Napoleon FranÃ ois Joseph Charles Bonaparte , also known as the Duke of Reichstadt ) .
Simplified: Many Europeans , and Viennese in particular , suspected that he was actually fathered by Napoleon II of France , also known as the Duke of Reichstadt ) .