Imperial Highness

The first dynasty to use the style on the generic basis were the Romanovs in the eighteenth century; the archdukes and archduchess of the House of Habsburg were only styled as Royal Highness given the officially elective nature of the Holy Roman Empire.With the establishment of the Austrian Empire in 1804 their style was changed to that of Imperial and Royal Highness. es:Tratamientos protocolares de la monarquía

Imperial Highness

The first dynasty to use the style on the generic basis were the Romanovs in the eighteenth century; the archdukes and archduchess of the House of Habsburg were only styled as Royal Highness given the officially elective nature of the Holy Roman Empire.With the establishment of the Austrian Empire in 1804 their style was changed to that of Imperial and Royal Highness. es:Tratamientos protocolares de la monarquía