Princess Charlotte will be honoured with the rarest official Royal title when her father Prince William becomes King.The seven year old’s current title is Her Royal Highness Princess Charlotte Elizabeth Diana of Cambridge, however this will change once her grandfather Prince Charles succeeds the throne.Titles of honours and dukedoms assigned to the Royal Family have historical and political significance, and have been handed down from generations of monarchs that came before. While Princess Charlotte’s brothers Prince George and Prince Louis will each have important senior royal titles, her new title will have unique importance, as it is one that only seven of her Royal ancestors have previously shared.