ロイヒテンベルク公
Auguste Charles Eugène Napoléon de Beauharnais, Duke of Leuchtenberg (9 December 1810 – 28 March 1835) was the first prince consort of Maria II of Portugal. Besides being the 2nd Duke of Leuchtenberg and 2nd Prince of Eichstätt, he also held the Brazilian noble title of Duke of Santa Cruz.