suffered to live, either from inadvertence, or from some of the causes noted already, as when Giovann’ Andrea of Lampognano, with the help of his companions, put to death the Duke of Milan. For the son and two brothers of the Duke, who survived him, were able to avenge his death. In cases like this, indeed, the conspirators may be held excused, since there is nothing they can do to help themselves. But when from carelessness and want of due caution someone is allowed to live whose death ought to have been secured, there is no excuse. Certain conspirators, after murdering the lord, Count Girolamo of Forli, made prisoners of his wife and of his children who were still very young. By thinking they could not be safe unless they got possession of the citadel, which the governor refused to surrender, they obtained a promise from Madonna Caterina, for so the Countess was named, that on their permitting her to enter the citadel she would cause it to be given up to them, her children in the meantime remaining with them as hostages. On which undertaking they suffered her to enter the citadel. But no sooner had she got inside than she fell to upbraid them from the walls with the murder of her husband, and to threaten them with every kind of vengeance; and to show them how little store she set upon her children, told them scoffingly that she knew how others could be got. In the end, the rebels having no leader to advise them, and perceiving too late the error into which they had been betrayed, had to pay the penalty of their rashness by perpetual banishment.
But of all the dangers which may follow on the execution of a plot, none is so much or so justly to be feared as that the people should be well affected to the prince whom you have put to death. For against this danger conspirators have no resource which can ensure their safety. Of this we have example in the case of Caesar, who as he had the love of the Roman people was by them avenged; for they it was who, by driving out the conspirators from Rome, were the cause that all of them, at different times and in different places, came to violent ends.