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There are several ways in which the Roman Catholic Church responded to the Protestant movement. Starting off, Pope Paul IV established the Index of Forbidden Books, which was approved and revised by the Council of Trent. This list of forbidden books was formed so followers and churchgoers would not be led astray from Christianity by reading "inappropriate" or "misleading" books. They also responded to what they saw as attacks against the church through persecution and inquisitions. Lastly, the Council of Trent occurred under the reigns of 5 popes. The council's decisions marked what was known as the Counter-Reformation. Their decisions included the acceptance of a few protestant ideas: The selling of indulgences was forbidden, seminaries were to be built to train and educate priests, and bishops could only exercise power in areas they lived in. However, they did of course deny other more complicated ideas. Hope this helped!
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