Prince Harry and Meghan Markle will become the Duke and Duchess of Sussex when they get married today. The Queen has gifted the titles to her grandson and his bride-to-be as they prepare to walk down the aisle of St George's Chapel in Windsor.  The royal groom's dukedom is the highest rank in the British peerage and marks his marriage to the former US actress. She will become the first ever Duchess of Sussex later on today as her new husband is made the first Duke of the county in 175...