Bertita Harding (1902 – 1971) royal biographer with an easy and sometimes humorous style that made her a popular author.

Her book Phantom Crown, a biography of the tragic life of Emperor Maximilano and his wife Carlota of Mexico was turned into a screenplay by John Huston for the film Juarez (1939). Magic Fire, her biography of Richard Wagner, was made into a German film by William Dieterle in 1955.

Source: Wikipedia