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
Napoleon II and was popularized by the Edmond Rostand play, "L'Aiglon". When Napoleon I tried to abdicate on 4 April 1814, he said that his son would rule as Emperor. However, the coalition victors refused to acknowledge his son as successor, and Napoleon I was forced to abdicate unconditionally some days later. Although Napoleon II never actually ruled France, he was briefly the titular Emperor of the French in 1815 after the second fall of his father. When his cousin Louis-Napoléon Bonaparte became the next emperor by founding the Second French Empire in 1852, he called himself Napoleon III to acknowledge Napoleon