Princess Diana and King Charles III's marriage once again became a hot topic, thanks to The Crown Season 5. Though many know the former couple had a tumultuous romance, a royal author and a former royal aide claimed it was the worst behind closed doors.

Princess Diana's former chief of staff, Patrick Jephson, called out King Charles' former courtiers for spreading lies about the late royal. Alternatively, Christopher Andersen, who wrote "The King: The Life of Charles III," claimed the two's relationship was much darker than everyone thought it was.

Jephson worked closely with the People's Princess for eight years. He alleged on "The Scandal Mongers" podcast, via Page Six, that the monarch's staff ruined the princess' personality and image in a "systematic campaign," despite everyone knowing that he had an affair with Camilla Parker Bowles.

He argued that the claims against Princes William and Harry's mom weren't just "casual gossip." Though it happened already a long time ago, he was worried that the man whom many were supporting was now the King.

"These things should not be buried," he stressed. As it happened once, Jephson believed it could happen again.

He also expressed his frustration after Princess Diana was dubbed "a bit crazy" and "probably impossible." Jephson explained that the royal establishment would say the People's Princess was mentally troubled and not fit for the job. But for him, she was the sanest person he had ever met.

Meanwhile, Andersen told Fox News Digital that Princess Diana and King Charles' marriage became so dangerous that royal protection officers feared the weapons scattered around the palace. He alleged that the former Prince of Wales had a "huge and incredible temper."

He described His Majesty would usually throw tantrums and, at one point, toss a bootjack, a heavy wooden device put on hunting boots made of iron and wood, at his first wife's head. Fortunately, he missed her.

King Charles' former valet Ken Stronach claimed to Andersen that he was in the room when the incident happened. At the time, the former pair was said to be in a middle of an argument when the father-of-two grabbed a heavy wooden bootjack and threw it at his ex-wife, missing her head by inches.

Andersen added that King Charles had a "deep depression" and was even on the "verge of a nervous breakdown." Allegedly, he turned to one of his confidants, Arnold Goodman, and told him he had "nothing to live for," finding himself trapped in a "loveless marriage," fearing divorce and thinking of its consequences for his kids, the royal family, and the monarchy itself.