Life and Context

Aristotle arrived in Athens as a teenager to study under Plato and stayed for twenty years, first as a student and eventually as a rival. When Plato died, Aristotle left the Academy, spent time tutoring the young Alexander of Macedon, and eventually returned to Athens to found his own school, the Lyceum. It was there, walking its covered walkways with his students, that he assembled the most ambitious empirical study of government the ancient world would produce: a comparative survey of over a hundred and fifty city constitutions, most of which survive today only because he thought them worth describing.

The Political Animal

Aristotle's starting point was blunt: human beings are political animals, not by choice but by nature. A person who could live entirely outside a political community, he wrote, would have to be either a beast or a god. This was not a moral demand so much as an observation about what people are for. Just as an eye separated from the body is no longer really an eye, a person cut off from the life of the community cannot fully realize the capacities that make them human. Politics, on this view, is not a necessary evil imposed on otherwise free individuals. It is the setting in which a good human life becomes possible at all.

Constitutions and the Common Good

Where Plato reasoned from an ideal, Aristotle sorted the actual governments he had catalogued using a simple test: does this arrangement serve the common good, or does it serve only the rulers? Each answer produced three forms, one good and one corrupted, depending on whether one person, a few, or the many held power: kingship curdles into tyranny, aristocracy into oligarchy, and the rule of the many, at its best, into what Aristotle called polity, and at its worst into demagogic mob rule. No single form was best in the abstract. The right constitution for a given people depended on their size, their character, and their circumstances, which is part of why Aristotle is often read as the founder of comparative politics rather than of any one political program.

The Legacy

Aristotle's insistence on looking at how governments actually behave, rather than only at how they ought to, set a method that political science still follows. His idea that a stable order needs a broad middle class, that extremes of wealth and poverty destabilize a state, and that constitutions should be judged by whether they serve the whole community rather than a faction, all remain live arguments today. Centuries later, when thinkers wanted to talk about the state as something more than the personal possession of its ruler, it was Aristotle's vocabulary of citizenship, constitution, and the common good that they reached for first.