Philip is Queen Elizabeth II's husband. Diana was married to their son Prince Charles from 1981 until they divorced in 1996. Diana was killed in a Paris car crash in 1997, leaving Charles to raise their young sons William and Harry.
"She had enormous charisma, she was beautiful, she was very good at empathy with the general crowd ... and she had no feeling at all for her husband or his family," Hicks told the magazine about Diana. "She was really spiteful, really unkind to him -- and, my God, he's a man who needs support and encouragement. [The marriage] absolutely destroyed him. He looked grey and ghost-like. Now, of course, he's blossomed again."
Charles married current wife Camilla Parker Bowles in 2005.
Celebrity Breakups and divorces of 2014 [PHOTOS]