In this dedicatory note, the author offers his most precious possession—his distilled knowledge of the actions of great men—as a gift to a prince.
CHAPTER I. HOW MANY KINDS OF PRINCIPALITIES THERE ARE, AND BY WHAT MEANS THEY ARE ACQUIRED

Machiavelli justifies his right to analyze the behavior of princes by arguing that one must be a commoner to truly understand the nature of a ruler, just as one must be a prince to understand the people.

A foundational classification of political structures, defining all states as either republics or principalities, with the latter being either hereditary or newly acquired.

The author explains that hereditary rulers have an easier time maintaining power because their long-standing authority feels natural to subjects, reducing the need for disruptive innovations.

Machiavelli explains that people often revolt against their rulers in the hope of improvement, only to find that the necessities of new rule inevitably make their situation worse than before.