The Collegium Hosianum was the Jesuit collegium in Royal Prussia, , founded in 1565, 1566 by Cardinal Stanislaus Hosius in Braunsberg . The city of Braunsberg was then part of the Diocese of Warmia , a prince-bishopric under rule of Cardinal Hosius. The Collegium Hosianum was one of the biggest Jesuit schools and one of the most important centres of Counter-Reformation in Europe and was particularly established to educate Catholic clergy of different countries.
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