Why does Machiavelli begin by discussing a variety of principalities?

[Ann]

In Chapter 1, these distinctions are made in order to account for the different events that have occurred in the history of government. Machiavelli wants to present a convincing account, so he frequently claims that an effective prince follows the historical examples of other great rulers. Machiavelli also provides accounts that seem to explain exceptions to his rules but depend on different situations. For example, Machiavelli discusses that the Roman emperor Severus ruled stably despite being hated by the people. Given that Machiavelli frequently states that no prince can rule when he is hated, an explanation is needed. The explanation given is that Severus had the favor of his armies, which were a significant force in the Roman Empire. The armies protected Severus from the hate of the people.