The Co-Cathedral of the Nativity of the Blessed Virgin Mary (Polish: Konkatedra Narodzenia Najświętszej Maryi Panny ) also called Żywiec Cathedral It is the main Catholic religious building in the city of Zywiec, Poland, and the co-cathedral of the Diocese of Bielsko-Zywiec. The church was elevated to the co-cathedral of the Diocese of Bielsko-Zywiec, simultaneously with the erection of the new diocese on March 25, 1992 with the Bull "Totus Tuus Poloniae populus" of Pope John Paul II.