Line of succession to the French throne (Bonapartist) sons, and it seemed unlikely that he would have any due to the age of his wife, Joséphine de Beauharnais. His eventual response was to have his marriage to Josephine annulled and to undertake a second marriage with Roman Catholic rites to Archduchess Marie Louise, daughter of Emperor Francis I of Austria. Their only child was Napoleon, King of Rome, known in exile as "Napoleon II" and as the Duke of Reichstadt. He died unmarried, thereby extinguishing the legitimate descent of Napoleon I. Meanwhile, Napoleon I's older brother, Joseph Bonaparte, recognized upon establishment of the First Empire as first in
Titles and styles of Napoleon Titles and styles of Napoleon Napoleon, a French military and political leader who rose to prominence during the French Revolution, was bestowed many titles and honours. His Imperial Majesty Napoleon I, By the Grace of God and the Constitutions of the Republic, Emperor of the French, Mediator of the Swiss Confederation. His Imperial and Royal Majesty Napoleon I, By the Grace of God and the Constitutions of the Republic, Emperor of the French, King of Italy, Mediator of the Swiss Confederation. His Imperial and Royal Majesty Napoleon I, By the Grace of God and the Constitutions of the Republic, Emperor