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
Coronation of Napoleon I or witnessing the civil oath that followed, due to its contents. With his hands on the Bible, Napoleon took the oath: I swear to maintain the integrity of the territory of the Republic, to respect and enforce respect for the Concordat and freedom of religion, equality of rights, political and civil liberty, the irrevocability of the sale of national lands; not to raise any tax except in virtue of the law; to maintain the institution of Legion of Honor and to govern in the sole interest, happiness and glory of the French people. The text was presented to Napoleon by