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
William I of Württemberg Napoleon I and uncle of French Emperor Napoleon III. "United Kingdom": The British royal family were relatives of William's maternal grandmother Princess Augusta, the elder sister of King George III. George III's eldest daughter Charlotte, was the second wife of Frederick I of Württemberg and thus his stepmother. "Netherlands": Sophie, William's second daughter from his marriage to Catherine, married in 1839 her cousin, William, prince of Orange, who in 1849 became King of the Netherlands. William III was the son of Catherine's sister Anna Pavlovna of Russia. On 8 June 1808, in Munich, he married Caroline Augusta (1792–1873), daughter of