Inquisition in AP World History: Modern

Before 1450: medieval tribunals hunting heresy

Church courts against heresy existed in Europe long before the AP World time period. In the Middle Ages, popes sent inquisitors to root out groups like the Cathars in southern France.

Those earlier tribunals mostly answered to the Church. That's the baseline to keep in mind, because what changed after 1450 was who controlled the courts and what they were used for.

1478: Ferdinand and Isabella turn it into a royal tool

Ferdinand of Aragon and Isabella of Castile asked the pope for permission to create their own Inquisition, and he granted it in 1478. Unlike the medieval tribunals, this one was run by the Spanish monarchy, which appointed its officials.

Its first targets were conversos, Jews who had converted to Christianity and were suspected of secretly practicing Judaism. Later it pursued moriscos, converted Muslims under the same suspicion. Accused people could be interrogated (sometimes under torture), and punishments ranged from public penance to execution, often announced at public ceremonies called autos-da-fé. The same push for religious unity produced the expulsion of Spain's Jews in 1492.

This is where the term fits in Unit 3: Land-Based Empires (1450-1750), inside Topic 3.3: Belief Systems of Land-Based Empires. The topic asks how belief systems both persisted and shifted from 1450 to 1750, and the Spanish Inquisition is a clear case of a ruler using religion to legitimize power. One enforced faith made subjects easier to control and tied loyalty to the Church to loyalty to the crown. Spain later set up tribunals in its American colonies too, including in Mexico City and Lima, so the institution traveled with the empire.

1540s onward: redirected against Protestants

When the Protestant Reformation split Western Christianity, the Inquisition got a new target. In 1542 Pope Paul III created the Roman Inquisition to fight Protestant ideas in Italy, and Spanish tribunals also prosecuted suspected Protestants. The Roman Inquisition later tried Galileo in 1633 for supporting the idea that the Earth moves around the sun.

The common mix-up is treating the Inquisition and the Catholic Counter-Reformation as the same thing. The Counter-Reformation (also called the Catholic Reformation) was the Church's whole response to Protestantism: the Council of Trent, the Jesuits, new missionary work. The Inquisition was one enforcement institution inside that response.

Timing matters too. The Spanish Inquisition started in 1478, decades before Martin Luther's 95 Theses in 1517, so it wasn't created because of Protestantism. If an answer choice says the Inquisition began as a reaction to Luther, it's wrong.

Using Spain's Inquisition as evidence for state religion

The Inquisition works best as specific evidence for a bigger claim. In a Long essay (Question 2) about belief systems or how empires consolidated power from 1450 to 1750, a strong sentence ties the fact to the argument: "Spain's monarchs used the Inquisition to enforce Catholic orthodoxy, linking religious unity to royal authority." That gets you evidence and analysis in one line.

It also sets up comparisons. The Safavids made Shi'a Islam the state faith and clashed with the Sunni Ottomans, so religion and state power fused there as well. Emperor Akbar's tolerance toward Hindus in the Mughal Empire is the useful contrast, since he gained legitimacy through inclusion instead of enforced conformity.

In multiple-choice questions and the Short-answer question 2 (Primary source), you might get a text about the Reformation or Catholic responses and need to explain its context or a historical process. A trial record or a decree on heresy would be a natural stimulus. For the continuity-and-change skill, the Inquisition shows persistence: Catholic institutions and monarchs held onto traditional orthodoxy even as the Reformation broke Christianity apart.