Imperial and Royal Highness (in German: Kaiserliche und königliche Hoheit) is a style possessed by someone who either through birth or marriage holds two individual styles, Imperial Highness and Royal Highness.
The style is used by members of the Habsburg dynasty who use the titles Prince Imperial and Archduke of Austria and Prince Royal of Bohemia and Hungary. One contemporary example of this is Prince Lorenz, Archduke of Austria-Este and his children who are members of the Belgian, Hungarian, and Bohemian Royal Families and of the Austrian Imperial Family at the same time.
The style was also used by the eldest son of the German Emperor who was the German Crown Prince and Crown Prince of Prussia, and also by his wife who was crown princess. It may be used for the head of the House of Hohenzollern, as a sign of respect, however, like all members of former German noble families, in law he is considered to be just another citizen of Germany, and as such holds no title officially.
Grand Duchess Elena Vladimirovna of Russia, upon her marriage to Prince Nicholas of Greece, was styled Her Imperial and Royal Highness. Her aunt, Grand Duchess Maria Alexandrovna of Russia was alternately styled Her Imperial and Royal Highness and Her Royal and Imperial Highness upon her marriage to Prince Alfred, Duke of Edinburgh, the second son of Queen Victoria. Use of both styles upon marriage was not universal. Grand Duchess Elena's cousin, Grand Duchess Maria Pavlovna, ceased use of her Imperial style upon her marriage to Prince Vilhelm of Sweden and Norway, Duke of Södermanland.
In 1909, the members of the Orléans-Braganza Branch of the former Brazilian Imperial Family signed an agreement with Prince Philippe, Duke of Orléans (1869–1926), the Head of the House of Orléans (the former Royal Family of France), called the "family pact". By this agreement, all of them were counted in the French line of succession, being properly styled "Royal Highness". Combined with the earlier style "Imperial Highness", determined in the Imperial Constitution of 1824[1], since then on the Head of the family (named The Prince of Brazil), the Heir to the Headship (named Imperial Prince), and the eldest son of the Imperial Prince (Prince of Grão-Pará) uses the style "Imperial and Royal Highness". Other princes/princesses of the Orléans-Braganza branch (Prince/Princess of Orléans-Braganza) uses the style Royal Highness, and the members of the Saxe-Coburg-Braganza branch (Prince/Princess of Saxe-Coburg-Braganza) kept the style Highness.
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