British historian Anna Keay has been appointed as the official biographer of the late Queen Elizabeth II, with King Charles granting her access to the monarch's personal and official papers held in the royal archives. Keay, 51, known for works including The Restless Republic: Britain Without a Crown, will also interview members of the royal family and those who knew the queen personally. The appointment is considered significant as Elizabeth II was the United Kingdom's longest-reigning monarch, and her authorised biography is expected to draw on an unparalleled body of private material.