Princess Diana was the first person who shared details about her failing marriage to Prince Charles decades ago. At first, the heir to the throne didn’t want to air their dirty laundry to the press.

But in 1995, the Princess of Wales was reportedly tricked into giving an interview with Martin Bashir for Panorama. According to Sarah Ferguson, Bashir was supposed to ask the late royal about her charity work, but he ended up asking about the Prince and Princess of Wales’ marriage.

Since the topic was a bit sensitive for Princess Diana, she ended up saying a lot of things that shocked the entire nation. But according to Express, statements about the couple’s marriage weren’t necessarily what hurt Prince Charles the most.

“Perhaps the most destructive claim in the whole interview was not so much to do with her and Charles’s marital problems, but the assertion he would not make a suitable king,” Frederica Miller, a journalist for Express, said.

Bashir asked Princess Diana if she thinks Prince Charles will ever be King, and she said that she doesn’t know the answer to the question.

“But who knows, who knows what fate will produce, who knows what circumstances will provoke? There was always conflict on that subject with him when we discussed it, and I understood that conflict, because it’s a very demanding role, being Prince of Wales, but it’s an equally more demanding role being King,” she said.

In the end, Princess Diana said that she doesn’t know if Prince Charles could adapt to the enormous limitations that may be brought about by the top job. After all, the late royal thinks she knows her ex-husband’s character all too well.

Royal author Penny Junor said in her book “The Firm” said that this was the moment when Prince Charles felt that he was publicly executed by his ex-wife. And even though he didn’t want the interview, Camilla and his closest friends told him about it.

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Princess Diana And Prince Charles watch an official event during their first royal Australian tour 1983 in Newcastle, Australia. Patrick Riviere/Getty Images