Princess Diana gave a royal phone book to the News of the World royal editor so he could "take on" her estranged husband, an English court has heard.
Former News of the World royal editor Clive Goodman told the Old Bailey he received the book in 1992 as Diana was looking for an ally in the press to combat Prince Charles, the BBC reported.
Diana sent the book the same year she separated from Charles, in an attempt to expose the war that was being raged against her in the press by Charles' staff, Goodman said.
"She told me she wanted me to see the scale of her husband's staff and household, compared with others.
"She felt she was being swamped by people close to his household.
"She was looking for an ally to take him on - to show there were forces that would rage against him."
Goodman said the book "worked its way into my pigeonhole" and that Diana then called him to check he had received it.
"She was going through a very, very difficult time," he told the court.
Goodman is one of seven people on trial in relation to phone hacking.
He is accused of paying police for royal phone books, which he denies.
The book was "one of a number that came to me over a number of years", said Goodman, who denies conspiracy to commit misconduct in a public office.
Asked if any of the books came from public officials, he said: "No, not one of them."
Goodman had a previous conviction in 2007 for phone hacking.
He also spoke of an aggressive and combative newsroom, where he was often bullied by senior editors.