The beloved pontiff now rests next to one of St. Peter's most admired attractions, Michelangelo's statue of the Pieta. His tomb is indicated by an inscribed stone that reads "Beatus Joannes Paulus II."
"It has never happened before that the body of a pope has been removed to make way for another pope, especially when both have been beatified," Francesco Sorti, co-author of the historical thriller "Imprimatur," told the Times of London.
The book is based on secret documents that Sorti and co-author Rita Monaldi discovered in both the Vatican Secret Archives and the Italian State Archives.
The documents reveal that the Odescalchis, a rich banking family that Pope Innocent XI belonged to (he was born Benedetto Odescalchi), loaned a huge sum to the Protestant king William of Orange in the 1660s.
William needed the money for his 1688 campaign to overthrow James II, England's last Catholic monarch.
According to the authors, when Odescalchi became pope, he supported the Protestant king in the hope that he would get his money back. In doing so, Innocent XI basically supported the Protestant invasion of England.