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King Charles III and Princess Diana had a complicated marriage, to say the least. There was a significant age gap between the two, which reportedly contributed to their divorce , as did infidelity on both sides and diverse personalities. But one surprising incident involving an 8-year-old William, Prince of Wales, seemed to be the nail in the coffin for the late princess.

Back in 1991, Prince William was playing with a friend when he accidentally took a major hit to the head. According to Andrew Morton's book " Diana: Her True Story — in Her Own Words ," the young royal was taken to the hospital, where he'd need surgery right away for his "depressed fracture of the skull" (via Daily Mail ). Morton's book said, "They made it

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