Wenceslaus IV of Bohemia
As a younger son, Bogisław possibly had prepared for an ecclesiastical career and suspiciously eyed the appointment of John Brun, chancellor of Wenceslaus IV of Bohemia, then king of Germany, as Bishop of Cammin in 1386. To defend the bishopric's autonomy, he concluded an agreement with the cathedral chapter the next year, granting him the rights of a diocesan administrator. Though rigorously opposed by the bishop, Bogisław prevailed and could assume the episcopal ministry himself upon John Brun's death in 1394, however, he resigned four years later in favour of the Culm bishop Nicholas.