Sultanic Highness

His Sultanic Highness was an honorific of the Sultan of Egypt.

History

In 1914, as a result of the declaration of war against the Ottoman Empire, the United Kingdom declared a protectorate over the territory. The British deposed the Egyptian Khedive, replacing him with a family member who was made Sultan of Egypt.
With the Egyptian Revolution of 1919, the departure of the British from Egypt, and the proclamation of the Kingdom of Egypt in 1922, the country was recognized by the United Kingdom as a sovereign nation. Sultan Fuad I was made king of Egypt, with the style of Majesty, and his descendants became Their Royal Highnesses, the princes and princesses of Egypt.