Who Should Rule? What the Ancient Greeks and Romans Thought About Politics

Imagine you and your friends are trying to decide what game to play. One person says, “I’m the strongest, so I should decide.” Another says, “I’m the richest—I have the best ball, so I pick.” A third says, “Let’s just vote.” And a fourth person says, “Actually, let’s think about what would be the best game for everyone, and choose that.”

This is basically the argument that ancient Greek and Roman philosophers had about politics—but instead of a game, they were arguing about who should run the whole city, and what makes that fair.

The ancient Greeks invented the idea of politics (the word comes from polis, their word for city-state). And then a small group of thinkers—philosophers—decided that politics needed to be questioned. They asked: Is a city just a bunch of people living together? Or should it help people live good lives? Who gets to decide what “good” means? And what happens when what’s good for you isn’t good for me?

The Big Puzzle: Is Justice Real, or Just a Trick?

Before there were philosophers, Greek poets and storytellers assumed that justice was built into the universe. If you were fair, things would go well. If you were cruel, you’d eventually be punished. Justice was what held a city together.

But then in the 5th century BCE, a group of traveling teachers called sophists started asking uncomfortable questions. They noticed that different cities had completely different laws. In one place, stealing was punished by death; in another, by a fine. So which laws were really natural? Maybe laws were just made up by people—and maybe they were made up by the powerful to benefit themselves.

A sophist named Thrasymachus argued bluntly: “Justice is nothing other than the advantage of the stronger.” In other words, every city’s laws are just whatever the rulers say they are, and the rulers make laws that help themselves. Justice is a con.

Another sophist, Callicles, argued something even more disturbing: that real “natural justice” was actually the strong dominating the weak. Laws against stealing were just inventions by the weak majority to protect themselves from the strong. In nature, the lion eats the sheep. Pretending otherwise is just cowardice.

So here was the puzzle: If justice is just a human invention, why should anyone be just—especially if they’re powerful enough to get away with being unjust?

Socrates: The Gadfly Who Died for His Questions

Socrates (469–399 BCE) was a strange, barefoot philosopher who walked around Athens asking people embarrassing questions. He wasn’t a professional teacher like the sophists—he didn’t charge money. He just talked to people. And what he talked about was virtue: What is courage? What is justice? What makes a life worth living?

Socrates thought most people talked about these things but had no idea what they actually meant. A general would claim to know what courage is, but under questioning, would contradict himself. A politician would claim to know what justice is, but couldn’t define it.

This made people angry. Eventually, at age 70, Socrates was put on trial. The charges: not worshiping the city’s gods, introducing new gods, and corrupting the young. But many historians think the real reason was political: some of Socrates’ students had helped overthrow the democracy a few years earlier.

In his defense speech (which Plato wrote down), Socrates said something remarkable: that he was like a gadfly stinging a lazy horse—the city of Athens. His mission was to wake people up and make them think about virtue. When the jury sentenced him to death, he accepted it calmly. His friend Crito tried to convince him to escape, but Socrates refused. Why? Because, he argued, he had lived his whole life benefiting from Athens’ laws. He had agreed to follow them by staying in the city. Escaping would be like cheating at a game you agreed to play.

This raises a question philosophers still argue about: Do we have an obligation to obey unjust laws? Socrates seemed to say yes—at least when obeying doesn’t require you to do something unjust yourself. He drank the poison hemlock and died.

Plato: The Perfect City in the Sky

Socrates didn’t write anything down. But his most famous student, Plato (424–348 BCE), wrote dialogues in which Socrates argues with various people. Plato’s most famous book, the Republic, is about justice—but it’s also about building the perfect city.

The Republic starts with a challenge. Glaucon, Plato’s brother, asks: Suppose there were a magic ring that made you invisible. Would anyone still be just? Wouldn’t everyone—if they could get away with it—take what they wanted? And if so, isn’t justice just something we pretend to believe in because we’re too weak to be unjust?

To answer this, Socrates does something strange. He says: Let’s build an imaginary city from scratch and see what justice looks like there. In this city, everyone does the job they’re naturally suited for. Some people are workers, some are soldiers, and a very few—the philosophers—are rulers. Why philosophers? Because they’ve spent their lives studying what is truly good and true, not just what people happen to want. They know the “Form of the Good”—a kind of perfect, abstract reality that ordinary people can barely glimpse.

This city, the kallipolis (“beautiful city”), isn’t democratic. The philosophers rule not because they want power, but because they’re the only ones who know enough to rule well. They don’t get paid, they don’t own property, they don’t even have private families. Everything is shared, because personal wealth and family loyalty would distract them from ruling fairly.

This sounds extreme—and most philosophers since Plato have rejected it. But Plato’s point was serious: If you really want justice, you might need to re-think everything about how society is organized. Private property, family, democracy—maybe these aren’t natural. Maybe they’re just habits we’ve gotten used to.

The Republic also argues that justice isn’t just about what you do to others—it’s about the health of your own soul. Plato thought the human soul has three parts: reason, spirit (anger, ambition, honor), and appetite (desire for food, sex, money). A just person is one where reason rules, spirit supports reason, and appetite obeys. An unjust person is like a city in civil war—different parts fighting for control, making you unhappy and unable to act effectively.

So Plato’s answer to Glaucon is: Even if you had the ring of invisibility, being unjust would still make you miserable, because it would make your soul chaotic and sick. Justice isn’t just about following rules—it’s about being a properly ordered, healthy human being.

Aristotle: The Political Animal

Aristotle (384–322 BCE) was Plato’s student, but he disagreed with his teacher on many things. Where Plato wanted to build an ideal city from scratch, Aristotle preferred to study real cities and figure out what worked. He collected information about over 150 different constitutions (only one survives—the Constitution of Athens).

Aristotle’s most famous claim is that “man is by nature a political animal.” This doesn’t just mean we live in groups—bees and ants do that too. It means we can only fully become who we are through politics. Language lets us discuss justice and goodness together. A person who lives completely alone is either a beast or a god—not a full human being.

But if we’re all political animals, who should rule? Aristotle thought this was the central question of politics. Different groups give different answers:

Democrats say: “Everyone should rule equally.”
Oligarchs say: “The rich should rule.”
Aristocrats say: “The best people should rule.”
Monarchists say: “The single best person should rule.”

Aristotle thought all of these answers were partly right—but only partly. The problem is that each group only sees one kind of equality. Democrats notice that we’re all equally free (if we’re not slaves), so they think everyone should have equal political power. Oligarchs notice that some people contribute more money, so they think those people should have more power. Aristocrats notice that some people are more virtuous, so they think those people should rule.

What’s the real answer? Aristotle said: The best regime is one where all the citizens (not slaves, not women, not foreigners—just free adult men) take turns ruling and being ruled. This is what he called “polity”—a mixed constitution where the middle class is strongest, because the middle class is less likely to be greedy or resentful than either the very rich or the very poor.

But Aristotle also admitted a weird exception: If someone is so amazingly virtuous that they’re like a god compared to other people, then they should rule without limits. This person is “a law unto themselves.” But Aristotle seemed to think such people almost never exist. For normal cities, the rule of law is better than the rule of any single person.

What About Slavery?

This is the hardest part of ancient political philosophy. Both Plato and Aristotle assumed slavery was natural. Aristotle actually argued that some people are “natural slaves”—people whose reason can’t properly rule their desires, so they need a master to guide them. He even claimed that certain “barbarian” peoples (non-Greeks) fit this description.

But Aristotle also mentions that other philosophers had already argued against slavery. These unnamed thinkers said slavery is “contrary to nature” and “unjust”—it’s just force, not justice. We don’t know exactly who these people were, but their arguments have survived only because Aristotle quoted them to disagree.

This is a good reminder: Ancient political philosophy was created by a small group of elite men. It was about inclusion—who gets to participate in ruling—but it was also deeply exclusive. Women, slaves, and foreigners were left out. Modern political philosophy has had to grapple with that legacy.

The Stoics: Citizens of the World

After Aristotle, new schools of philosophy emerged. The Stoics (founded by Zeno around 300 BCE) had a very different vision. They believed that there is a “natural law” that applies to all humans everywhere—not just to Greeks or Romans. Reason is the same everywhere, and a truly wise person would recognize that all rational beings are fellow citizens of the cosmos.

This idea—cosmopolitanism, or being a “citizen of the world”—was revolutionary. It suggested that your real political community isn’t your city or nation, but the entire human race (and even the gods). This didn’t mean Stoics rejected ordinary politics. Many of them were active in Roman government. But it meant that your ultimate loyalty was to reason and justice, not to any particular flag.

The Stoics also influenced Roman political thinkers, especially Cicero (106–43 BCE). Cicero was a lawyer, orator, and politician who translated Greek philosophy into Latin. He wrote about the “mixed constitution”—the idea that the best government combines elements of monarchy (one ruler), aristocracy (the best people), and democracy (the people). He argued that the Roman Republic was exactly this kind of mixed constitution.

Cicero also wrote about “natural law”—a standard of justice that exists independently of what any government says. If a law violates natural law, it’s not really a law at all. This idea would later be hugely influential for Christian thinkers and modern human rights.

Why This Still Matters

Ancient political philosophers were asking questions we still argue about:

Is justice natural or invented?
Should everyone have an equal say, or should experts rule?
Is politics about helping people live well, or just keeping them from hurting each other?
What do we owe to people outside our own community?

These questions don’t have easy answers. The Greeks and Romans didn’t resolve them—they just showed that they’re worth arguing about. And they showed that how you think about politics depends on how you think about human nature, knowledge, and the good life. You can’t separate politics from philosophy.

So next time someone says “that’s not fair,” or “who made them the boss?”, or “why should I follow this rule?”—you’re doing ancient political philosophy. You just might not have realized it.

Appendix A: Key Terms

Term	What it does in the debate
Justice	The quality that holds a city together, but also the subject of deep disagreement—is it natural, invented, or just whatever benefits the powerful?
Polis	The Greek city-state, the basic unit of political life that philosophers were analyzing and sometimes criticizing
Constitution (politeia)	Not just a document, but the whole way of life of a city—who rules, how they rule, and what values they promote
Natural law	The idea that there are standards of justice that don’t depend on any particular government’s laws—they’re built into the universe itself
Mixed constitution	A government that combines elements of monarchy, aristocracy, and democracy, supposed to be more stable than any pure form
Political animal	Aristotle’s claim that humans can only fully flourish by participating in political life with others
Cosmopolitanism	The idea that all human beings (or all rational beings) are fellow citizens of one universal community

Appendix B: Key People

Socrates (469–399 BCE): A barefoot philosopher who never wrote anything, forced people to question their beliefs, and was executed for it.
Plato (424–348 BCE): Socrates’ student who wrote dialogues and imagined a perfect city ruled by philosopher-kings.
Aristotle (384–322 BCE): Plato’s student who studied real cities, argued humans are political animals, and thought about who should rule.
Cicero (106–43 BCE): A Roman lawyer and politician who translated Greek ideas into Latin and argued for natural law and mixed government.
Thrasymachus (5th century BCE): A sophist who argued that justice is just whatever benefits the rulers.
Zeno (c. 334–262 BCE): Founder of Stoicism, who wrote a Republic imagining a world where all virtuous people are fellow citizens.

Appendix C: Things to Think About

Plato thought the best rulers would be people who don’t want to rule—they’d do it out of duty. Do you think people who don’t want power would actually be better rulers? Or would they just be bad at it?
If you had a ring that made you invisible, would you still follow the rules? What does your answer tell you about why you’re actually moral?
Aristotle said the middle class should rule because they’re neither greedy nor resentful. Do you think this is still true? Or do people in the middle have their own blind spots?
The Stoics said we’re all citizens of the world. But we also have special obligations to our family, friends, and country. Can these two ideas be reconciled? Or are they in conflict?

Appendix D: Where This Shows Up

In school: Debates about student councils, classroom rules, and who gets to decide what—all of these are tiny versions of the arguments Plato and Aristotle were having.
In video games and movies: Stories about corrupt rulers, wise kings, plucky democracies, and “the one person who can save us” are all working with ancient ideas about constitutions.
In politics today: Arguments about whether experts or ordinary people should make decisions, whether laws should be based on tradition or reason, and whether countries should help people outside their borders—all of these have roots in ancient debates.
In human rights: The idea that some things are just wrong no matter what any government says (torture, slavery, genocide) comes straight from the Stoic idea of natural law.