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AP WHist · Period 2

Counter Reformation Catholicism strikes back.

The Counter Reformation was the Catholic Church’s response to the Protestant Reformation — Council of Trent, the Jesuits, the Roman Inquisition. AP World History and AP European History both test it. This guide covers the key elements.

Updated May 2026Part of AP World History Maps

What was the Counter Reformation?

By the mid-1500s, the Protestant Reformation had cost the Catholic Church about a third of Europe. The Counter Reformation (or Catholic Reformation) was the Church’s answer: internal reform plus a counter-offensive against Protestantism.

It lasted roughly 1545–1648, ending with the Peace of Westphalia.

Key elements

Council of Trent (1545–1563)
Three sessions of bishops in northern Italy. Reaffirmed Catholic doctrine (no compromise with Protestants), reformed clerical training, prohibited the sale of indulgences.
The Jesuits (Society of Jesus, founded 1540)
Ignatius of Loyola’s order. Highly educated, organized like a military structure, deployed as missionaries from China to the Americas. Became the Catholic Church’s shock troops.
Roman Inquisition (1542)
A church court targeting heresy. Less brutal than the Spanish Inquisition but suppressed Protestant texts and prosecuted figures like Galileo.
Index of Forbidden Books (1559)
List of texts Catholics were forbidden to read. Lasted until 1966.

AP exam relevance

AP World History tests the Counter Reformation as part of Period 2 (c. 1450–1750) under “Transoceanic Connections.” AP European History tests it in the Reformation era. FRQs often compare Catholic and Protestant Reformations — know specific reformers (Luther, Calvin, Loyola) and specific actions (95 Theses, Council of Trent).

Frequently asked questions

Quick answers — written by humans, not a chatbot.

Was the Counter Reformation purely defensive?

No. It included aggressive missionary work — the Jesuits expanded Catholic presence in Asia, the Americas, and parts of Africa during this era.

How is the Counter Reformation different from the Catholic Reformation?

They’re often used interchangeably. Some historians use “Catholic Reformation” for internal reforms (Trent, new orders) and “Counter Reformation” for actions against Protestants. The AP exam accepts either term.

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