Based on Amanda Foreman's best-selling novel Georgiana, Duchess of Devonshire.

Directed by Saul Dibb, the film is an adaptation of Amanda Foreman's 1998 book, Georgiana, Duchess of Devonshire ... great grandfather, George Spencer, 2nd Earl Spencer. Knightley takes on ...

Duchess of Devonshire. Interestingly, Georgiana was a distant relative of Princess Diana. The Duchess was the older sister of Diana's great, great, great grandfather, George Spencer, 2nd Earl Spencer.