The Crown Season 4 is expected to take viewers through 1990, when Margaret Thatcher was ousted as prime minister

Deadline

Season 4 is expected to cover the entire 1979-1990 prime ministership of Gillian Anderson's Thatcher. The Crown plans to delve into Thatcher's relationship with Queen Elizabeth II, who was six months younger than her. According to Deadline, Thatcher "was said to have had a 'punctiliously correct' relationship with Her Majesty, but many have said that there was 'little love lost on either side' and according to declassified files, The Queen was thought to have been angry with Thatcher’s refusal to back sanctions against South Africa’s racist apartheid regime."