Lutheranism also continued to spread. The edict of 1540 confesses as much while providing new and sterner penalties against those who even interceded for heretics. The fact is that the inquisition as directed against Lutherans was thoroughly unpopular and was resisted in various provinces on the technical ground of local privileges. The Protestants managed {245} to keep unnoticed amidst a general intention to connive at them, and though they did not usually flinch from martyrdom they did not court it. The inquisitors were obliged to arrest their victims at the dead of night, raiding their houses and hauling them from bed, in order to avoid popular tumult. [Sidenote: 1543] When Enzinas printed his Spanish Bible at Antwerp the printer told him that in that city the Scriptures had been published in almost every European language, doubtless an exaggeration but a significant one. Arrested and imprisoned at Brussels for this cause, Enzinas received while under duress visits from four hundred citizens of that city who were Protestants. To control the book trade an oath was exacted of every bookseller [Sidenote: 1546] not to deal in heretical works and the first "Index of prohibited books," drawn up by the University of Louvain, was issued. A censorship of plays was also attempted. This was followed by an edict of 1550 requiring of every person entering the Netherlands a certificate of Catholic belief. As Brabant and Antwerp repudiated a law that would have ruined their trade, it remained, in fact, a dead letter. Charles's policy of repression had been on the whole a failure, due partly to the cosmopolitan culture of the Netherlands and their commercial position making them open to the importation of ideas as of merchandise from all Europe. It was due in part to the local jealousies and privileges of the separate provinces, and in part to the strength of certain nobles and cities. The persecution, indeed, had a decidedly class character, for the emperor well knew Protestant nobles whom he did not molest, while the poor seldom failed to suffer. And yet Charles had accomplished something. Even the Protestants were loyal, strange to say, to him personally. The number of martyrs in his reign has been estimated at barely one thousand, {246} but it must be remembered that for every one put to death there were a number punished in other ways. And the body of the people was still Catholic, even in the North. It is noteworthy that the most popular writer of this period, as well as the first to use the Dutch tongue with precision and grace, was Anna Bijns, a lay nun, violently anti-Lutheran in sentiment. [Sidenote: Anna Bijns, 1494-1575] [1] Brabant, Limburg, Luxemburg, Guelders, Flanders, Artois, Hainaut, Holland, Zeeland, Malines, Namur, Lille, Tournay, Friesland, Utrecht, Overyssel and Groningen. SECTION 2. THE CALVINIST REVOLT