Casting such a show likeThe Crownis no easy feat.

“It’s nerve-wracking because people invest in the original people,” casting director Robert Sterne toldElle.

The casting process forThe Crownis intense and starts a year before the season even starts filming.

Claire Foy as Queen Elizabeth II

There’s a lot that goes into picking the right actor.

“But at the same time, they’ve got to get the spirit of it right.”

“Diana was a big deal,” said Sterne.

Emma Corrin smiling

The international search took Sterne and the casting team all over the U.S., U.K., and Australia.

They auditioned hundreds of professional and amateur actors before settling onEmma Corrin.

“It was completely open,” said Sterne.