The Collegium Hosianum was the Jesuit collegium in Royal Prussia, Poland, founded in 1565, 1566 by Cardinal Stanislaus Hosius in Braniewo (Braunsberg). The city of Braniewo was then part of the Diocese of Warmia (Ermland), a semi-autonomous part of Poland with cardinal Hosius as its prince-bishop. 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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