Imperial Highness
George's father Maximilian de Beauharnais, 3rd Duke of Leuchtenberg had traveled to St. Petersburg, eventually winning the hand of Grand Duchess Maria Nikolaevna, Nicholas I's eldest daughter in 1839. Maximilian was subsequently bestowed with the style "Imperial Highness". As the son of a Russian grand duchess and an ennobled Russian prince "Romanowsky", George and his siblings were treated as princes and princesses of the blood, bearing the styles "Imperial Highness".