A direct outcome of the Council of Trent, the Index librorum prohibitorum ("Index of Prohibited Books") provided a list of authors and works that were banned by the Catholic Church. The first Tridentine Index prohibited the complete writings of 610 authors, identified 69 additional authors whose prohibited works were listed individually, and banned 297 anonymous titles. As would be the case with all indexes of prohibited books, no explanation for a text's suppression was provided.
ACY3341. Pius IV (b. 1499, Pope 1559–1565). Index librorum prohibitorum, cum regulis confectis per patres a Tridentina Synodo delectos, auctoritate sanctiss. D.N. Pii IIII, Pont. Max. comprobatus. Rome: Paulus Manutius, 1564.
Manuzio, Paolo, 1512–1574, printer., “ACY3341,” Bridwell Library Special Collections Exhibitions, accessed October 2, 2022, https://bridwell.omeka.net/items/show/1929.