The site of the current chapel was originally the entrance to the castle. The exact date of the chapel’s construction is not known. This room is now divided in half by fragments of the castle’s old stone balustrades. In the centre, behind the balustrade is an oval stone altar mensa supported by a pillar in the shape of the biblical Tree of Life with the serpent tempting Eve in the Garden of Eden. Above it hangs a painting depicting St. Casimir – the patron saint of the Lands of Dobczyce. He stayed in the castle while taking lessons from the famous Polish historian, Jan Długosz. Items found during archeological digs included a metal incense holder (‘navicula’), an altar cruet, an altar olive lamp, a metal statue of the Crucified Christ with traces of gilding, and a 14th-century tile depicting St. Wojciech (Adalbert). These finds unquestionably indicate the existence of a chapel here.