Buckingham Palace has announced that the Queen had bestowed the title of the Duke of Sussex on her grandson, Prince Harry. His bride, Meghan Markle, will be known as Duchess of Sussex after the royal wedding ceremony at St George's Chapel. Meghan also becomes her royal highness.
The Queen has also made her grandson Earl of Dumbarton and Baron Kilkeel.
Buckingham Palace said in a statement: "The Queen has today been pleased to confer a Dukedom on Prince Henry of Wales. His titles will be Duke of Sussex, Earl of Dumbarton and Baron Kilkeel.
"Prince Harry thus becomes His Royal Highness The Duke of Sussex, and Ms. Meghan Markle on marriage will become Her Royal Highness The Duchess of Sussex."
It is customary for the monarch to offer new royal titles to members of the family when they are married. When Harry and Markle's engagement was announced last year, it was expected that the sixth-in-line to the throne would be offered a dukedom, the highest-ranking title in the British peerage system. Sussex, which was among the vacant titles like Albany and Clarence, was the favourite.