After reading Haslip's biography of Lucrezia Borgia, I know much more about how the RC Church of the 15th C worked than about Sra. Borgia's poisoning escapades. She was much more the pawn of her father's, POPE Alexander VI, and her brother's, Cesare, avaricious ambitions.
Her marriages were arranged with political ends in mind rather than her desires or interests.
The unwholesomeness said to have existed in her relationships with both her father and brother Cesare was hinted at in this text, but never fully fleshed out. While there are records of the trashy spectacles produced in the Vatican during Pope Alexander VI's reign, nothing conclusive was presented to support the charges of incest.
I learned an awful lot about the RC Church of the time and was quite scandalized, just as I am with today's Church antics, but I see the current acts have a long documented history.
Then, there is the Index of Prohibited Literature of 1501, which prohibited, banned, censored the reading of all books and/or documents that challenged church dogma, a gift of Pope Alexander VI, the same man who hosted parties in the Vatican that included dancing, naked women who picked up chestnuts with their backsides.