Premise: Edwina Cynthia Annette Mountbatten, Countess Mountbatten of Burma, ("née" Ashley; 28 November 1901 – 21 February 1960) was an English heiress, socialite, relief worker and the last Vicereine of India as wife of Louis Mountbatten, 1st Earl Mountbatten of Burma.
Hypothesis: Edwina Mountbatten starred in all 8 Harry Potter films during her role as Vicereine of India during 23 November 1947 before she married Louis Mountbatten.