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What events led the Roman Catholic Church to begin the Counter-Reformation?

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Title page of a 1568 Welsh Christian doctrine book by Morys Clynnog, featuring Welsh text and a woodcut illustration of the crucifixion of Jesus at the center. — Counter-Reformation Title page of *Athravaeth Gristnogavl* (1568; “Christian Doctrine”), a Roman Catholic catechism translated into Welsh by Morys Clynnog as part of the church's Counter-Reformation efforts.

The Counter-Reformation was primarily triggered by the Protestant Reformation, which challenged the spiritual authority of the Roman Catholic Church and exposed deep-seated internal issues.12

Key Catalysts for Reform

Doctrinal Challenges: The rise of Protestantism, led by figures such as Martin Luther, introduced teachings—such as justification by faith alone and the sole authority of Scripture—that directly opposed traditional Catholic doctrine and sacramental life.12
Internal Corruption: By the late 15th century, the church faced widespread criticism regarding the worldly attitudes, greed, and corruption of the clergy and the papacy. Flagrant abuses, such as the sale of indulgences to finance projects like St. Peter’s Basilica, severely damaged the church's reputation.123
Need for Institutional Renewal: The church recognized a critical need to address administrative and moral failures, including pluralism and the lack of proper clerical education.1

The formal response began in earnest with the Council of Trent (1545–1563), which defined Catholic doctrine and enacted sweeping disciplinary reforms to revitalize the church in the face of Protestant expansion.14