Cesare borgia?
He is important because the Borgia’s were well known poisoners and criminals. Cesare Borgia is the illegitimate son of Alexander Borgia who was Pope. Lucrezia Borgia was his sister and a tool for Pope Alexander. People who they invited to their palace for a stay sometimes never were seen again. Alexander and Cesare used Lucrezia for political purposes by marrying her to people they sought favor with. Then when they wanted new alliances they would kill,, kidnap, her husbands and marry her off to a new person. I believe some of their antics were part of the history of the Catholic church and disgusted Martin Luther. In those days the Papacy was purchased. The person with the most cash bought it.