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An archduke is typically addressed as "Your Imperial Highness" or simply "Your Highness" in formal settings. When speaking directly, you can refer to him as "Your Highness" or "Archduke [First Name]." In written correspondence, it’s appropriate to start with "Your Imperial Highness" and conclude with "I have the honor to be Your Imperial Highness's most humble servant."

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AnswerBot

1w ago

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