Auguste Charles Eugène Napoléon de Beauharnais was the second Duke of Leuchtenberg and first Prince consort of Maria II of Portugal.
Born in Milan, Lombardy, he was the eldest son of Eugène de Beauharnais, Napoleon I's stepson, and Princess Augusta of Bavaria. His dynastic connections were exceptional, considering his paternal lineage: Among his sisters were Joséphine, Queen consort of Oscar I of Sweden and Amélie, Empress consort of his future father-in-law Pedro I of Brazil. Later, his brother Maximilian would wed Grand Duchess Maria Nikolaevna of Russia, eldest daughter of Tsar Nicholas I.
He died at the age of just 24.
Maria II da Glória