That it is as hard a matter to preserve a princedom as it is to preserve a commonwealth, will be shown in the Chapter following.
From what befell the elder Tarquin at the hands of the sons of Ancus, and Servius Tullius at the hands of Tarquin the Proud, we see what an arduous and perilous course it is to strip a king of his kingdom and yet suffer him to live on, hoping to conciliate him by benefits. We see, too, how the elder Tarquin was ruined by his belief that he held the kingdom by a just title, since it had been given him by the people and confirmed to him by the senate, never suspecting that the sons of Ancus would be so stirred by resentment that it would be impossible to content them with what contented all the rest of Rome. Servius Tullius again, was ruined through believing that he could conciliate the sons of Ancus by loading them with favours.
By the fate of the first of these kings every prince may be warned that he can never live securely in his princedom so long as those from whom he has taken it survive; while the fate of the second should remind all rulers that old injuries are not to be healed by subsequent benefits, and least of all when the new benefit is less in degree than the injury suffered. And, truly, Servius was wanting in wisdom when he imagined that the sons of Tarquin would contentedly resign themselves to be the sons-in-law of one whom they thought should be their subject. For the desire to reign is so prevailing a passion, that it penetrates the minds not only of those who are rightful heirs, but also of those who are not; as happened with the wife of the younger Tarquin, who was daughter to Servius, but who, possessed by this madness, and setting at naught all filial duty, incited her husband to take her father’s kingdom, and with it his life; so much nobler did she esteem it to be a queen than the daughter of a king. But while the elder Tarquin and Servius Tullius lost the kingdom from not knowing how to secure themselves against those whom they had deprived of it, the younger Tarquin lost it from not observing the ordinances of the old kings, as shall be shown in the following Chapter.
Tarquin the Proud, when he had put Servius Tullius to death, inasmuch as the latter left no heirs, took secure possession of the kingdom, having nothing to fear from any of those dangers which had stood in the way of his predecessors. And although the means whereby he made himself king were hateful and monstrous, nevertheless, had he adhered to the ancient ordinances of the earlier kings, he might have been endured, nor would he have aroused both senate and people to combine against him and deprive him of his government.