^Beckford, Martin (29 April 2011). "Royal wedding: Prince William and Kate Middleton become Duke and Duchess of Cambridge". The Telegraph. Retrieved 1 August 2013. Buckingham Palace said in a statement published at 8am on Friday: 'The Queen has today been pleased to confer a Dukedom on Prince William of Wales. 'His titles will be Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus. 'Prince William thus becomes His Royal Highness The Duke of Cambridge and Miss Catherine Middleton on marriage will become Her Royal Highness The Duchess of Cambridge.'
^"Media pack for the birth of the first child of The Duke and Duchess of Cambridge". Kensington Palace. July 2013. Retrieved 8 August 2013. On the occasion of his marriage, The Queen conferred a Dukedom on Prince William of Wales. The Duke received the titles of Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus. As a result Miss Catherine Middleton became Her Royal Highness The Duchess of Cambridge, Countess of Strathearn and Lady Carrickfergus.