Aga Khan IV
The style of "His Highness" was formally granted to the Aga Khan IV by Queen Elizabeth II in 1957 upon the death of his grandfather Aga Khan III. The granting of the title to the Aga Khan IV was preceded by a strong expressed desire of the Aga Khan III to see the British monarchy award the non-hereditary title to his successor. The style of "His Royal Highness" was granted in 1959 to the Aga Khan IV by Mohammad Reza Pahlavi, the Shah of Iran, later overthrown in the Iranian Revolution of 1979, but he uses instead "His Highness".