Season four is set during the end of the 1970s, as Elizabeth looks to safeguard the line of succession by finding a bride for Prince Charles (Josh O’Connor), still a swinging bachelor at 30.
The series also charts the growing tensions between Thatcher and the queen, as the prime minister leads the country into the Falklands War.
Emma Corrin will play Lady Diana Spencer, whose growing popularity among the British public forms one of the series’ secondary storylines.
The Crown also stars Helena Bonham Carter as Princess Margaret, Tobias Menzies as the Duke of Edinburgh, Erin Doherty as Princess Anne, Emerald Fennell as Camilla Parker Bowles and Marion Bailey as the Queen Mother.
Season three of The Crown received mixed reviews upon its release.
In a three-star write-up for The Independent, Ed Power wrote: “As with the real Elizabeth, it is grand yet a bit colourless, gilded but never quite glamorous.
“Everything it does is in lockstep, as if hidebound by conventions as inflexible as the ones which bind the monarch in real life.”
The Crown will be on Netflix from 15 November.