The tumultuous marriage of Prince Charles and Princess Diana has been an open secret in the history of royal romances. Unlike others, Princess Diana has never shied away from speaking her mind — often at the cost of her repute in the royal family.

Turns out, Diana’s affable and straightforwardness earned her the wrath of the Queen’s sister, Princess Margaret, Countess of Snowdon. Margaret despised her to such an extent that she refused to keep any images of Diana in her house, and stern orders were made to implement the same.

Going back in time, there’s reportedly a reason behind the animosity toward Diana. “There were always three of us in the marriage,” said Diana in an interview with BBC ‘s Panorama in 1995 with Martin Bashir, which created a furor world over. 

Needless to say, the statement never went well with most members of the royal family, especially with Prince Charles’s aunt. Princess Margaret believed at that time that Princess Diana’s revelation was unpardonable.

“It had a massive impact and decimated her relationship with the Palace,” the Countess of Snowdon said. “This was it. This was like a suicide note to being a royal wasn’t it?”

It was in the year 1992 when the Princess of Wales separated from the Prince of Wales. But it took four long years before the divorce came through.

A 2019 Channel 5 documentary titled “The Royal Family At War” shed light on how Margaret thought Diana’s comments were “unacceptable.” According to royal correspondent Katie Nicholls, Margaret decided from that moment on not to speak to Diana ever again after the interview was broadcast, even though they both still lived at Kensington Palace. 

Princess Margaret and Antony Armstrong-Jones Princess Margaret with her husband, born Antony Armstrong-Jones, photographer Lord Snowdon, attend Badminton Horse Trials on April 18, 1970, in Badminton, England. Getty Images/Anwar Hussein/WireImage

“Princess Margaret would turn over any magazine that had Diana on the cover,” royal biographer Andrew Morton also said in the documentary. “She told her staff not to talk to anybody from Diana’s apartments. It was a cold war,” he added.

More often than not, it didn’t end there. Princess Margaret often had a watchful eye over Diana. It has been alleged that whenever Diana had a boyfriend, Margaret would be there behind the curtains, watching over her.

What’s interesting is that Diana’s former butler, Paul Burrell, revealed that Diana often ignored Margaret’s actions. “Margaret would be watching, keeping an eye on what Diana was doing,” Burrell said. “Hi Margot, how are you?” Diana would say.

Princess Diana Princess Diana's royal visit to Halifax, Nova Scotia, in June 1983. Russ Quinlan/Flickr