Father Malachi Martin wrote about this.
"These allegations have largely gone unnoticed, possibly because he was so crafty in his descriptions that he might even have been referring to the coronation of Pope Paul VI. But he revealed much more about this alleged ritual in one of his last works, Windswept House: A Vatican Novel (1996). In this story, he vividly described a ceremony called “The Enthronement of the Fallen Archangel Lucifer” supposedly held in St. Paul’s Chapel in the Vatican, but linked with concurrent satanic rites here in the U.S., on June 29, 1963, barely a week after the election of Paul VI. In the novel, before he dies, a pope leaves a secret account of the situation on his desk for the next occupant of the throne of Peter, a thinly-disguised John Paul II.
According to The New American, Martin confirmed that the ceremony did indeed occur as he had described. “Oh yes, it is true; very much so,” the magazine reported he said. “But the only way I could put that down into print is in novelistic form.” "