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In 1587, the diocese was secularized by the regent of Ducal Prussia, George Frederick.
Celestyn Myślenta (also Mislenski; 27 March 1588 in Kuty (Kutten), Ducal Prussia – 20 April 1653 in Königsberg (Królewiec)) was a Polish Lutheran theologian and rector of the University of Königsberg.
Hans Daubmann (born, in Torgau, died in 1573 in Königsberg) was a German printer, active in Nuremberg and then Königsberg, Ducal Prussia (at the time a fief of Kingdom of Poland).
Following King Sigismund III's Prussian regency contract (1605) with Joachim Frederick of Brandenburg and his Prussian enfeoffment contract (Treaty of Warsaw, 1611) with John Sigismund of Brandenburg these two rulers of Ducal Prussia guaranteed free practice of Catholic religion in prevailingly Lutheran Prussia.