Meet the Duke and Duchess of Cambridge Royal duo get new handles right before big do By Mary Papenfuss, Newser User Posted Apr 29, 2011 2:00 AM CDT Updated Apr 29, 2011 4:49 AM CDT 0 comments Comments Britain's Prince William and Kate Middleton pose for photographers after announcing their engagement late last year. (Getty Images) (Newser) – Britain's queen has dubbed her grandson the Duke of Cambridge, making Kate Middleton Her Royal Highness the Duchess of Cambridge, Buckingham Palace officials announced shortly before the spectator-mobbed wedding procession was to begin. It's customary for royal couples to be granted new names at the time of their marriage, notes AP. Observers believe Kate will still be generally known as Princess Kate. The title of duke is the highest rank in the British peerage, notes the BBC. William has also been given the title today of Baron Carrickfergus and the Scottish title Earl of Strathearn, making his wife the Baroness Carrickfergus and the Countess of Strathearn. The Dukedom of Cambridge was created in 1801 but became extinct on the death of the second duke of Cambridge in 1904. The second duke of Cambridge, Prince Adolphus Frederick, was the seventh son of King George III. Frederick refused to participate in an arranged marriage and wed his commoner actress mistress in 1847. Since the marriage wasn't legal, his children were all illegitimate.