In 1917, King George V decreed that the title HRH (which extends to princes and princesses) were reserved for "the children of the sovereign, the children of the sovereign’s sons and the eldest son of the eldest son of the Prince of Wales." But before Prince George's birth in 2013, Queen Elizabeth II issued Letters Patent under the Great Seal of the Realm — a public proclamation — ordering that "all children of the eldest son of the Prince of Wales should be able to use the HRH title." The proclamation reads:
"The Queen has been pleased by Letters Patent under the Great Seal of the Realm dated 31 December 2012 to declare that all the children of the eldest son of The Prince of Wales should have and enjoy the style, title and attribute of Royal Highness with the titular dignity of Prince or Princess prefixed to their Christian names or with such other titles of honour."
For now, she will be known as the Princess of Cambridge.
