Auguste de Beauharnais, Duke of Leuchtenberg, Prince Consort of Portugal | Unofficial Royalty (http://www.unofficialroyalty.com/auguste-de-beauharnais-duke-of-leuchtenberg-prince-consort-of-portugal/)
QuoteAuguste Charles Eugène Napoléon de Beauharnais was born December 9, 1810 at the Royal Villa of Monza, just outside of Milan, Italy. He was the eldest son of Eugène de Beauharnais and Princess Augusta of Bavaria, a daughter of King Maximilian I of Bavaria, and had had six siblings:
I knew that Auguste's father Eugene had the title Duke of Leuchtenberg. This article informed me that Eugene had the additional title of Prince of Eichstätt.
It was interesting to learn that Queen Maria II chose Auguste as her husband because he was not a member of an already reigning dynasty.