what is catholic reformation?

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The Counter-Reformation also called the Catholic Reformation or the Catholic Revival was the period of Catholic resurgence that was initiated in response to the Protestant Reformation. It began with the Council of Trent and largely ended with the conclusion of the European wars of religion in 1648.
The Catholic Reformation was the intellectual counter-force to Protestantism. The desire for reform within the Catholic Church had started before the spread of Luther. Many educated Catholics had wanted change – for example, Erasmus and Luther himself, and they were willing to recognize faults within the Papacy.
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Counter-Reformation, also called Catholic Reformation or Catholic Revival, in the history of Christianity, the Roman Catholic efforts directed in the 16th and early 17th centuries both against the Protestant Reformation and toward internal renewal.
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