In addressing the pope, we say at the top of the letter, Holy Father, or Most Holy Father; and instead of You, we should say, Your Holiness; to a prince cardinal, My Lord, and Your Most Eminent Highness.
To a cardinal, My Lord, and Your Eminence.
To an archbishop or bishop, My Lord, and Your Grace.
To an emperor or empress, we say, Sire, or Madam; and instead of You, we say, Your Imperial Majesty.
To a king we also say, Sire, and Your Majesty.
To a queen, Madam, and Your Majesty.
To the brother of a king, Your Royal Highness.
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To an elector of the empire, Your Electoral Highness.
To a sovereign prince, Your Most Serene Highness.
To a prince, Your Highness.