The Great Parisian Condemnation of 1277

The Strange Case of the Banned Ideas

Imagine you’re a student at a university in Paris in the year 1277. You sit down to a lecture on philosophy, and your teacher starts explaining an idea from Aristotle—the famous Greek philosopher whose works had recently been rediscovered in Europe. Maybe he says something about whether the world has always existed, or whether humans have a single shared mind, or whether God can do absolutely anything.

A few weeks later, the Bishop of Paris publishes a list. 219 ideas that you are now forbidden to teach. If you teach them anyway, you’ll be excommunicated—kicked out of the Church. And if you confess within seven days, the bishop will decide your punishment.

What was on this list? Why did someone think these ideas were dangerous? And what does any of this have to do with how we think about philosophy and science today?

What Actually Happened

On March 7, 1277, a man named Stephen Tempier—the Bishop of Paris—published a document listing 219 “errors.” These were philosophical and theological claims that he said no one should teach, defend, or even discuss. This wasn’t the first time the University of Paris had banned some ideas, but it was by far the biggest.

The events leading up to it are a little murky, even for historians. We know that in January 1277, the Pope (John XXI) sent Tempier a letter saying he’d heard rumors of heresy at the university and asking the bishop to investigate. About six weeks later, Tempier published his enormous list. Some historians think he was acting on the Pope’s orders and got overzealous. Others think he was already working on the list when the Pope’s letter arrived. Either way, it was a dramatic move.

Here’s something odd: Tempier didn’t name any specific people in his list. He just said these errors were being spread by “certain scholars at the faculty of arts.” That was unusual. Most other condemnations at the time named the people being accused. Tempier kept his targets anonymous—though scholars today are pretty sure he had specific teachers in mind.

What Was Actually Banned?

The 219 articles cover a huge range of topics. Here are some of the things you couldn’t say if you were a teacher at the University of Paris after March 7, 1277:

That the world is eternal (has always existed, with no beginning)
That there’s only one intellect shared by all humans
That human beings don’t have free will
That God can’t do certain things because of the laws of nature
That happiness is possible in this life, rather than only after death
That philosophy can arrive at truth independently of faith

These weren’t random. They were mostly ideas that had come from newly translated works of Aristotle and his Islamic commentators (especially a thinker named Averroes). For centuries, much of Aristotle’s work had been lost in Europe. When it was rediscovered, it was like finding a whole new way of thinking about the world—but some of it directly contradicted Christian teachings.

The Big Philosophical Problem

Here’s the real heart of the matter. In the late 1200s, European universities were grappling with a huge question: What happens when reason and faith seem to disagree?

Aristotle had argued, for example, that the world is eternal—it always existed and will always exist. The Bible says the world was created by God at a specific point in time. Both can’t be true. So what do you do?

Some philosophers at the arts faculty had developed a way of dealing with this. They would say something like: “According to reason and philosophy, the world is eternal. But according to faith, it was created.” They weren’t claiming both were true in the same way—they were describing what each method of inquiry showed.

Tempier accused them of believing in “double truth”—the idea that two contradictory things could both be true at the same time. In his preface, he wrote angrily about people who acted “as if there were two contrary truths, and as if against the truth of Sacred Scripture, there is truth in the sayings of the condemned pagans.”

Here’s the thing: Most scholars today agree that no actual philosopher at the time believed in double truth. Nobody was literally saying “this is true according to reason AND this contradictory thing is true according to faith.” That would be absurd. What they were doing was much more subtle—they were trying to figure out what philosophy could tell us on its own terms, separate from faith.

Tempier may have misunderstood what they were doing. Or he may have understood perfectly well and thought it was dangerous anyway.

Who Was Really Being Targeted?

We know some names. Siger of Brabant was a famous philosophy teacher at the arts faculty. Boethius of Dacia was another. Both had been teaching Aristotelian ideas. In fact, Siger had already been investigated by the Inquisition a few months before Tempier’s condemnation.

But here’s a surprising fact: When scholars in modern times tried to match the 219 condemned ideas to actual writings by Siger and Boethius, they could only find clear matches for about 79 of them. For 68 articles, they couldn’t find any source at all. This suggests Tempier wasn’t just reacting to specific books or people—he was trying to shut down a whole way of thinking.

Some scholars think the list might have included ideas that were just floating around in student debates, never written down. Others think Tempier was also targeting theologians, not just arts teachers. The famous theologian Thomas Aquinas (who died three years before the condemnation) may have had some of his ideas banned too.

The Real Stakes

What was Tempier so worried about? Here’s one possibility: Some arts faculty teachers were starting to treat philosophy as something you could do without reference to faith at all. They were exploring what human reason could discover about the world, period. If reason said one thing and faith said another, they’d note the difference but keep doing philosophy.

This might sound harmless to us today—after all, we separate science from religion all the time. But in the 13th century, the University of Paris was a Christian institution. The whole point of education was supposed to lead toward understanding God. A philosophy that didn’t care about Christian truth was more than just annoying; it was dangerous. It could lead students astray, undermine faith, and challenge the authority of the Church.

Tempier wanted to make clear that philosophy had limits. You could study Aristotle, but ultimately, faith had to win if there was a conflict.

Did It Work?

The condemnation didn’t destroy philosophy at Paris. But it did change things. Teachers became more careful. They sometimes wrote two versions of their commentaries on Aristotle—one before the condemnation and one after, with the dangerous parts softened or changed.

In the longer run, the debate about faith and reason never went away. It kept popping up throughout the Middle Ages, and philosophers are still arguing about it today. The condemnation of 1277 is one of those moments where you can see a big philosophical battle happening in real time—a battle about how much we can know through reason alone, and whether our knowledge has to fit with what we believe.

Why You Should Care

Here’s what’s still interesting about the Condemnation of 1277. It wasn’t a simple story of “Church bad, philosophy good.” Tempier wasn’t just being narrow-minded. He saw something happening that genuinely worried him: smart people were starting to think about the world in a way that didn’t need God at all. That was new and, from his perspective, frightening.

And the arts teachers weren’t just rebels fighting for free thought. They were trying to figure out how to handle a genuinely difficult problem: what do you do when two ways of knowing (reason and faith) point in different directions?

You might run into this same problem in smaller ways. What if science tells you one thing and your family’s beliefs tell you another? What if you can prove something logically, but it feels wrong? What if you’re learning about a culture that had completely different ideas about the world—do you take them seriously even when they contradict what you think you know?

The Parisian philosophers of 1277 were facing that last question. And the bishop who condemned them was too. Neither side had an easy answer.

Appendices

Key Terms

Term	What it does in this debate
Condemnation	An official declaration that certain ideas are forbidden to teach, under threat of punishment
Double truth	The idea (which no medieval philosopher actually held) that two contradictory statements could both be true, one by reason and one by faith
Faculty of arts	The lower division of the medieval university, where students studied philosophy and sciences before moving on to theology, law, or medicine
Excommunication	Being cut off from the Catholic Church—a serious punishment that affected your legal and social standing, not just your spiritual life

Key People

Stephen Tempier – The Bishop of Paris who published the condemnation of 1277; he was worried that philosophy was becoming too independent from Christian faith
Siger of Brabant – A prominent philosophy teacher at the arts faculty whose Aristotelian ideas were among the targets of the condemnation; he was later killed (possibly assassinated)
Boethius of Dacia – Another arts teacher whose works contained many of the condemned ideas; known for arguing that philosophy could investigate the world on its own terms
Thomas Aquinas – A famous theologian whose ideas may also have been targeted in the condemnation, even though he died three years earlier and was later made a saint

Things to Think About

If you were a teacher in 1277, and you genuinely believed that philosophical reasoning led to conclusions different from Christian faith, what would you do? Would you stop teaching those conclusions? Would you try to hide them? Would you argue that faith should change instead?
Tempier condemned the idea that happiness is possible in this life (rather than only after death). Do you think that’s a dangerous idea? What would it mean if people believed they could be fully happy here and now?
Is there something you believe that you’re not allowed to question? Should there be? How would you decide which ideas are too dangerous or important to challenge?
The arts faculty teachers treated philosophy as something you could do “according to reason” without worrying about faith. Is that possible? Can you really bracket off what you believe and just follow logic wherever it goes?

Where This Shows Up

School debates about science and religion – Whenever someone says “evolution is just a theory” or “science and faith are compatible,” they’re wrestling with the same question the 1277 philosophers faced: what happens when different ways of knowing seem to conflict?
Book banning and censorship – Debates about what should and shouldn’t be taught in schools are happening right now, and they often involve similar questions about authority, truth, and what ideas are dangerous
The birth of modern science – Some historians argue that the Condemnation of 1277 helped pave the way for modern science by weakening the authority of Aristotle, making it possible to think of new explanations for how the world works
Your own thinking – Every time you learn something from one source (a book, a teacher, a friend) that conflicts with something you thought you knew, you’re facing the same kind of problem as a medieval philosopher: which way of knowing do you trust, and why?