	The creation of the separate Archdiocese of Gniezno, as directly subordinate to the Holy see rather than a German archdiocese, kept Poland independent from the Holy Roman Empire throughout the Middle Ages. Around 1075 the Bishopric of Poznań became a suffragan diocese of Gniezno. The archdiocese then controlled the whole Piast realm, as confirmed by the papal Bull of Gniezno in 1136.