As a young boy, Prince William served as a counselor to his mother, Princess Diana, as she faced the torments of a failed marriage and life in the public eye. And it was Princess Diana's eldest son who told his mother that she should leave her home base in England to escape the suffocating media attention, a royal photographer said in a documentary.

In 1997, Princess Diana's final summer, she was photographed more than usual, thanks to her budding romance with Dodi al-Fayed, who had become the most photographed woman in the world. Photographers followed their every move, and Diana finally decided she had had enough, according to Arthur Edwards, the Sun's longtime royal photographer, in his documentary "The Last Days of Diana, Princess of Wales: The Sun's Longtime Royal Photographer, The Daily Express" reported.

"Suddenly, she went down some stairs and very quickly got into the boat. I remember I picked up my camera and she said, "Don't take any pictures." She seemed to want to talk to us. She came over and said, 'Why are you here?'"

Press Pack replied, "Because you are here, ma'am."

Her reply shook Edwards.

"William told me I should leave England and live somewhere else," Diana replied.

Edwards said Diana was "in tears" and "obviously upset about something."

"I thought, 'I don't want to be the reason she lives in exile,'" Edwards said.

Watching his mother being hounded by the British press up close, William was pushed to learn from his past mistakes with his own wife, Kate Middleton, Katie Nicole said in her book, Kate: The Future Queen.

"William witnessed his mother being harassed by the paparazzi and was determined to ensure that Kate would not receive the same treatment," Nicole wrote.

Then, in a development that no one would have expected, in 1997, her younger son Harry, not Diana, left the UK to live elsewhere.