Index of Forbidden Books
The Index of Forbidden Books (Latin: Index Librorum Prohibitorum) was a list of books established by the Council of Trent (1545-1563 AD) in order to guard Catholics against publications deemed unsuitable (for example, having content that was considered heretical or immoral). Catholics were not allowed to read these books. Ironically, the Index itself at one point was placed on the list when it was found that it was being used as a shopping list for heretical books.
- Modern history sourcebook, Fordham University