Short answers, pulled from the story.
Napoleon II was the titular Emperor of the French for two days in 1815, following his father's second abdication after Waterloo. He never actually ruled; a five-member Commission of Government held power and never formally summoned him.
Napoleon II was posthumously given the nickname L'Aiglon, meaning "the Eaglet," a reference to his father the Emperor. The name became widely known after Edmond Rostand wrote a play called L'Aiglon about his life in 1900.
Napoleon II lived in Vienna, Austria from the spring of 1814 until his death in 1832. He was known in the Austrian court as Franz, Duke of Reichstadt, a title his maternal grandfather Emperor Francis granted him in 1818.
Napoleon II died of tuberculosis on the 22nd of July 1832, at Schonbrunn Palace in Vienna. He was twenty-one years old and had been bedridden for several months after contracting pneumonia in 1832.
Most of Napoleon II's remains were transferred from the Imperial Crypt in Vienna to the dome of Les Invalides in Paris on the 15th of December 1940, by order of Adolf Hitler. His heart and intestines remained in Vienna; his heart is held in Urn 42 of the Herzgruft.
Napoleon II's mother was Empress Marie Louise, daughter of Emperor Francis I of Austria. She left France with her son on the 23rd of April 1814 and never returned, later marrying Adam Albert von Neipperg with whom she had two children before their official marriage.