Austen Ivereigh, a former aide to Cardinal Cormac Murphy-O'Connor, has told a jury in a case of alleged libel that his "blood froze" when he read comments about himself published in the Daily Mail.
The article was based on allegations made by two women concerning their relationships with him and included a claim that one of the women had had an abortion.
He resigned from his £46,000 a year role as director of public affairs to the cardinal in July 2006.
Speaking from the witness box, Mr Ivereigh stated: "When I saw the article, I was just horrified, astonished. My blood froze. I simply could not believe that they could run this story because these were lies."
He accused the Daily Mail of publishing "untruths and lies", adding that the journalist who wrote the story had ignored his version of events. The trial is ongoing.