 Historians debate whether Bolko I came to Krakow for his own purposes, or rather as a governor on behalf of the new Czech king, John of Luxembourg, who was also using the title of King of Poland.However, John could not support this militant rebellion as a result of the problems he faced in Moravia with his own rebels.In any case, attempts to capture Wawel Castle failed, and strengthened by Hungarian support, Władysław the Short mastered the rebellion in Sandomierz and forced Bolko I of Opole to leave Krakow in June 1312.