---
title: "Henri IV — AP Euro Definition & Exam Guide"
description: "Henri IV converted to Catholicism to end the French Wars of Religion and issued the Edict of Nantes (1598). The classic AP Euro politique for Topic 2.4."
canonical: "https://fiveable.me/ap-euro/key-terms/henri-iv"
type: "key-term"
subject: "AP European History"
unit: "Unit 2"
---

# Henri IV — AP Euro Definition & Exam Guide

## Definition

Henri IV (r. 1589-1610) was the French king who converted from Calvinism to Catholicism to end the French Wars of Religion, then issued the Edict of Nantes (1598) granting Huguenots limited toleration. In AP Euro, he's the textbook politique who put political stability above religious uniformity.

## What It Is

Henri IV started out as Henri of Navarre, the Protestant (Huguenot) leader in the [French Wars of Religion](/ap-euro/key-terms/french-wars-of-religion "fv-autolink"). When he inherited the French throne in 1589, he had a problem. France was overwhelmingly Catholic, Paris refused to accept a Protestant king, and the country had been tearing itself apart in religious [civil war](/ap-euro/key-terms/civil-war "fv-autolink") for decades. His solution was pure pragmatism. He converted to Catholicism, reportedly saying "Paris is worth a Mass," trading his personal faith for a functioning kingdom.

That move makes him [AP Euro](/ap-euro "fv-autolink")'s favorite example of a **politique**, a ruler who treats religion as a political tool rather than a non-negotiable conviction. He followed up the conversion with the **Edict of Nantes (1598)**, which kept Catholicism as the official religion but gave Huguenots the right to worship in specified areas and hold fortified towns. The CED calls this out directly. France is the example of a state that "allowed religious pluralism in order to maintain domestic peace." Henri IV is the person who made that happen.

## Why It Matters

Henri IV lives in **Topic 2.4 (Wars of Religion)** in **[Unit 2](/ap-euro/unit-2 "fv-autolink"): Age of [Reformation](/ap-euro/key-terms/protestant-reformation "fv-autolink")**, and he's a direct hit on learning objective **AP Euro 2.4.A**, which asks you to explain how religion and politics influenced each other from 1450 to 1648. The essential knowledge for this LO names the French Wars of Religion as a case where religious reform worsened conflict between the monarchy and the nobility, and names the Edict of Nantes as the example of tolerating pluralism for the sake of peace. Henri IV is the hinge between those two points. He's also a building block for the bigger Unit 2 takeaway that by the mid-1600s (Peace of Westphalia, 1648), the dream of one unified Christendom was dead and rulers were openly choosing state interest over religious unity. Henri IV got there fifty years early.

## Connections

### [Edict of Nantes (Unit 2)](/ap-euro/key-terms/edict-of-nantes)

This is Henri IV's signature act. The conversion got him into Paris; the [Edict of Nantes](/ap-euro/key-terms/edict-of-nantes "fv-autolink") (1598) actually ended the fighting by giving Huguenots legal toleration. On the exam, treat the king and the edict as one package, the politique and his policy.

### [Catherine de' Medici (Unit 2)](/ap-euro/key-terms/catherine-de-medici)

Catherine represents the phase of the Wars of Religion that Henri IV ended. Her era included the [St. Bartholomew's Day Massacre](/ap-euro/key-terms/st-bartholomews-day-massacre "fv-autolink"), where Catholic-Protestant violence spun out of royal control. Henri IV is the contrast case, the ruler who stopped exploiting religious division and started managing it.

### [Act of Supremacy (Unit 2)](/ap-euro/key-terms/act-of-supremacy)

[Henry VIII](/ap-euro/key-terms/henry-viii "fv-autolink") used the Act of Supremacy to break from Rome and put the English church under the crown. Henri IV did the reverse, joining the Catholic Church to secure his crown. Together they show the same lesson from opposite directions. Religion served state power, not the other way around. The 2025 LEQ comparing the English and French Reformations is built on exactly this contrast.

### [Peace of Westphalia (Unit 2 into Unit 3)](/ap-euro/key-terms/peace-of-westphalia)

Westphalia (1648) made the politique logic continental. Rulers, not popes, would decide religious questions inside their states. Henri IV's France is the early proof of concept. And the story keeps going. Louis XIV revoked the Edict of Nantes in 1685, which makes Henri IV a great starting point for a continuity-and-change argument about French religious policy.

## On the AP Exam

Multiple-choice questions usually hand you a passage about the French Wars of Religion or the Edict of Nantes and ask what it shows about the relationship between religion and state power. The answer almost always points to the politique idea, putting political stability above confessional purity. On the free-response side, Henri IV is high-value evidence. The 2023 LEQ asked you to evaluate the most significant political or social change of the Reformation period (1517-1650), and Henri IV's pragmatic conversion plus the Edict of Nantes is exactly the kind of specific evidence that shows the shift from religious to political priorities. The 2025 LEQ asked for the most significant difference between the Protestant Reformation in England and in France, and Henri IV anchors the French side of that comparison. Don't just name him. Explain the move (Protestant claimant converts, then legislates toleration) and connect it to the bigger claim that state-building was winning out over religious unity.

## Henri IV vs Henry VIII of England

Easy to mix up because both are Reformation-era kings named Henry who changed their country's religious situation. But they moved in opposite directions. Henry VIII left the Catholic Church (Act of Supremacy, 1534) to control religion himself, and his Reformation was imposed top-down by the crown. Henri IV joined the Catholic Church (1593) to end a bottom-up religious civil war he couldn't win as a Protestant. England's Reformation succeeded as state policy; France's Protestant movement was contained, and Catholicism stayed official with the Edict of Nantes carving out toleration. If an LEQ asks you to compare the English and French Reformations, this is the contrast to build your thesis around.

## Key Takeaways

- Henri IV was the Huguenot leader who became king of France in 1589 and converted to Catholicism in 1593 because Catholic France would not accept a Protestant king.
- His line "Paris is worth a Mass" sums up the politique mindset, treating religious identity as negotiable when political stability is on the line.
- He issued the Edict of Nantes in 1598, keeping Catholicism official while granting Huguenots limited toleration, which ended the French Wars of Religion.
- The CED uses France under Henri IV as the example of a state allowing religious pluralism to maintain domestic peace, which is core essential knowledge for AP Euro 2.4.A.
- Henri IV previews the post-Westphalia world where rulers decided religious policy based on state interest, not the ideal of a unified Christendom.
- For comparison essays, remember the direction of the move. Henry VIII broke from Rome to gain power; Henri IV embraced Rome to gain power.

## FAQs

### Who was Henri IV and why did he convert to Catholicism?

Henri IV was the Huguenot leader who became king of France in 1589 during the French Wars of Religion. He converted to Catholicism in 1593 because overwhelmingly Catholic France, especially Paris, wouldn't accept a Protestant king. The conversion was a political calculation to end the civil war.

### Did Henri IV abandon the Huguenots after converting?

No. Five years after converting, he issued the Edict of Nantes (1598), which gave Huguenots the legal right to worship in designated areas and hold fortified towns. He protected the side he left, which is exactly why AP Euro treats him as a politique rather than a religious convert.

### How is Henri IV different from Henry VIII?

They moved in opposite religious directions for the same political reason. Henry VIII broke away from the Catholic Church with the Act of Supremacy (1534) to control religion in England, while Henri IV converted to Catholicism (1593) to end France's religious civil war. The 2025 LEQ comparing the English and French Reformations rewards exactly this contrast.

### What is a politique and why is Henri IV the main example?

A politique is a ruler who prioritizes the stability of the state over religious uniformity. Henri IV is the classic example because he switched faiths to secure his throne and then legislated toleration with the Edict of Nantes, treating religion as a problem to manage rather than a truth to enforce.

### Is Henri IV on the AP Euro exam?

Yes, through Topic 2.4 (Wars of Religion) and learning objective AP Euro 2.4.A. The Edict of Nantes is named in the CED's essential knowledge, and Henri IV works as evidence on LEQs about Reformation-era political change, like the 2023 prompt on significant changes from 1517 to 1650.

## Related Study Guides

- [2.4 Wars of Religion](/ap-euro/unit-2/wars-religion/study-guide/EGM2pS20VWvPTJslv7Se)

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