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Why did Pope Paul III become an important leader of 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.

Pope Paul III is recognized as the first pope of the Counter-Reformation because he initiated the formal reform movement that profoundly shaped the Roman Catholic Church in the 16th century. His leadership was pivotal for several key reasons:1

The Council of Trent: In 1545, he convened the Council of Trent, which served as a cornerstone for the Church's response to the Reformation. Despite significant political opposition and delays, he persisted in establishing this assembly to address both doctrinal matters and ecclesiastical discipline.213
Institutional Reform: He commissioned a report on internal Church abuses, which identified critical issues such as the ordination of unprepared priests and the appointment of incompetent bishops. He also worked to reorganize papal offices and encouraged the conversion and reform of the Roman clergy and curia.34
Support for New Religious Orders: Paul III actively fostered the growth of new religious congregations, most notably confirming the Jesuit order in 1540. This order became a primary instrument for the papacy in promoting the Counter-Reformation globally.45