This article discusses the mandate of the Prince published on the 24th November, 1541. It was published in the form of one–sided printed sheets (flyers for hanging) in Königsberg in the printing house of Jan Weinreich. In the mandate, the Prince condemned the reprehensible religious practices in his duchy, in particular the use of wax figures of human or animal figures and wax wreaths by brides within churches. He ordered priests, church servants and ducal officials to combat these practices. In the case of their further occurrence, he ordered the punishment of those who disobeyed. The authors of the article assume that the practices mentioned in the mandate were not so much related to the religious past of the Prussians, but to the remnants of Catholicism. Such practices involving wax sacrificial votive offerings were also known in Livonia, Germany and Poland.