The author, who will interview members of royal family for book, says being chosen for role is a ‘profound honour’

Anna Keay, a historian whose most celebrated book is about Britain’s republican period, has been confirmed as Queen Elizabeth II’s official biographer.

Keay will interview members of the royal family and the late queen’s friends and servants. She will also have access to the monarch’s personal and official papers held in the royal archives.

Keay, 51, has worked in close proximity to the royals. She spent seven years as assistant curator of Historic Royal Palaces, responsible for Hampton Court, the Banqueting House in Whitehall and the Tower of London.

She is the author of several historical books on the British monarchy, including The Last Royal Rebel: The Life and Death of James, Duke of Monmouth and The Restless Republic: Britain Without a Crown.