30 June 1818 : the Diocese of Włocławek is renamed (after the papal bullEx imposita nobis) Diocese of Cuiavia-Kalisz with the seat in Kalisz for over a century but this diocese returned to its first name on 28 October 1925.
25 June 2020: Pope Francis relieves Bishop Edward Janiak, age 67, of his responsibilities while he is investigating on charges of protecting "predator priests" who committed acts of sex abuse.[1] On October 17, 2020, Pope Francis permanently removed Janiak as Bishop of Kalisz.[2][3]
Special churches
Minor Basilicas:
Bazylika Matki Bożej Wspomożenia Wiernych, Twardogóra
Bazylika św. Józefa, Kalisz (Basilica of St Joseph)