Netflix show "The Crown" has become one of the most successful television shows. Now season four of "The Crown" has been released a few days ago. This season revolves around the testy relationship between Queen Elizabeth II and Prime Minister Margaret Thatcher, who served from 1979 to 1990.

In season four of The Crown, Prime Minister Margaret Thatcher became prime minister of the United Kingdom in 1979. The first woman prime minister of the U.K. made history for that fact alone, but in that show Queen Elizabeth and Thatcher did not have a natural chemistry, sharply differing when it came to personal temperament and worldly interests.

The Real Elizabeth also notes that, as time went on during Thatcher's more than 11 years as prime minister, the women developed a "mutual affection." A senior Buckingham Palace official said in the 2012 book, "The Queen always saw the point of Margaret Thatcher. She understood that she was necessary."

Although Senior officials close to the situation said there was “stiffness” between the two early in Thatcher’s term, per The Real Elizabeth: An Intimate Portrait of Queen Elizabeth II by Andrew Marr. Others said both women didn’t want to appear together because of the optics of having two women at the center of British leadership.

Margaret Hilda Thatcher was a British stateswoman who served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century and the first woman to hold that office.

A Soviet journalist dubbed her the "Iron Lady", a nickname that became associated with her uncompromising politics and leadership style. As prime minister, she implemented policies that became known as Thatcherism.

The show Crown traces the life of Queen Elizabeth II from her wedding in 1947 through to the present day and now the fourth season covers the period between 1977 and 1990, is set during Margaret Thatcher's premiership, and introduces Lady Diana Spencer, Prince William, and Prince Harry. Events depicted include the wedding of Prince Charles and Lady Diana Spencer, their 1983 tour of Australia and New Zealand, the Falklands War, Michael Fagan's break-in at Buckingham Palace, Lord Mountbatten's funeral, the Princess of Wales's appearance at the Barnardo's Champion Children Awards, and Mrs. Thatcher's departure from office.