Kapp says that the Petri edition of Luther’s _Testament_, printed in Basel, could hardly have found its way as far north as Saxony, and when, therefore, he finds record of the sale of copies in Meissen in 1523, as low as fifteen groschens, when the Wittenberg price was thirty groschens, it is evident that piracy editions must have been produced in the North as well as in the South. The activity of Magdeburg as a centre for the production and distribution of Protestant literature, has already been referred to. After the death of Luther, the publishing trade of Wittenberg, which had been the creation of his personality, slackened, and Magdeburg became the headquarters of the literary interests of the Reformers. The trade in Bibles and hymn books, and in the collected works of Luther was especially important, and continued until the destruction of the city by Tilly in 1631. The city of Münster was another place where Protestantism had taken a strong hold, and large supplies of the New Testament and of the Lutheran writings were distributed from the presses of Münster throughout Westphalia and the adjoining provinces on the north. The excesses of the Anabaptists, who, under John of Leyden and his associates, had possession of the town for a number of months, 1535-36, were, however, wellnigh destructive of its Protestantism, and proved fatal to its publishing business. In the general havoc which obtained both before and after the overthrow of the Anabaptists, books and printing-presses perished together. When the Catholic Bishop resumed his sway, the production of the Lutheran literature ceased, and there were but few Catholic publications to take its place. The story of the brief and dramatic rule of the Anabaptists in Münster was utilised by Meyerbeer for his opera, _The Prophet_. In 1562, an edict issued by the Bishop ordered the destruction of all Protestant books in Westphalia, and made it a misdemeanour to print, sell, or possess any such books. The sales continued notwithstanding, the supplies coming mainly from Magdeburg.