It is a fictional take on what happened when Diana decided during a family Christmas that she wanted out of her marriage to Prince Charles. “We’re not trying to educate anyone, we’re not trying to solve anything,” Kristen Stewart told Variety at the film’s Los Angeles premiere.

“We’re also not trying to like figure out whether or not we should have a monarchy. It’s what did it feel like to be her, think about what those nights were like, think about what those meals were like.

“It’s the moments in between… They could have done the dinners and opening presents and the photo ops, but they didn’t. They did getting dressed, cleaning up dirty dishes, and you know, crumpled up wrapping paper, I just think that’s such an interesting way to tell the story that everyone thinks they know so well.”

Stewart had four months to prepare before filming began.  “The script doesn’t profess to know anything, it doesn’t cover any black-and-white detail,” Stewart said.

“But I read everything. And somehow, in a sort of abstract way, the script substantiated everything I learned in detail. So it was really nice that ‘The Crown’ existed. And it was really nice that we’ve had all these documentaries and this evolved relationship with what happened.”

Writer and director Pablo Larrain said during the interview that the idea of casting Stewart came about because both women faced immense fame and unparalleled media scrutiny.

Stewart trained with dialect coach William Conacher, who also worked with Emma Corrin for ‘The Crown’ and with Naomi Watts when she played the titular role in 2013’s ‘Diana’.