Natascha McElhone portrays the Prince’s close pal on season 5 of The Crown.
Prince Philip became close to Penny Knatchbull following the death of her daughter Leonora from kidney cancer.
“Philip creates a friendship with her based on shared grief.

Jonathan Pryce as Prince Philip and Natascha McElhone as Penny Knatchbull on ‘The Crown’.Netflix

Penny Knatchbull and Prince Philip.Max Mumby/Indigo/Getty Images