There are few names in history that cause the same hostility as Borgia. Their contemporaries and subsequent generations made real monsters out of them. Streams were spilled on them, but not gold, but bile. Borgia was credited with the worst crimes, they were considered masters of treason and deception, who used stiletto and poison to achieve goals. In their personal lives, they had terrible sins, including incest. This family entered into open conflicts with many other Italian surnames: for example, with the Medici and Sforza. So you can easily guess the source of the "black legend" about Borgia.