vent the printing and spreading of noxious books.
But it was not until the beginning of the so-called Reformation that the boundless increase of heretical and other pernicious literature called for radical and extensive measures. They began in 1520 with the solemn condemnation of Luther's doctrine and the prohibition of his writings. About that time the first indexes or catalogues of forbidden books appeared. They were not issued by the popes, but emanated mostly from bishops, provincial councils, or universities. The civil power was expected to enforce them. In some cases the princes themselves or the magistrates of cities and republics issued their own indexes, in full harmony and after consultation with the clergy.
As the object of these measures was to safeguard the faithful against imminent danger, we can easily understand that catalogues of forbidden books were most numerous in those countries that were most exposed to heresy, namely, Germany, Belgium, France, and Northern Italy.
