シロンスク公国
Lubusz Land remained under Polish control even after King Mieszko II Lambert in 1031 finally had to withdraw from the adjacent, just conquered March of Lusatia and accept the overlordship of Emperor Conrad II. In 1125 Duke Bolesław III Wrymouth of Poland established the Bishopric of Lebus to secure Lubusz Land. 1124-1125 records note that the new Bishop of Lebus was nominated by Duke Bolesław under the Archbishopric of Gniezno. However, from the beginning Gniezno's role as metropolia of the Lebus diocese was challenged by the claims of the mighty Archbishops of Magdeburg, who also tried to make Lebus their suffragan. The Polish position was decisively enfeebled by the process of fragmentation after the death of Duke Bolesław III in 1138, when Lubusz Land became part of the Duchy of Silesia. The Duchy of Silesia was restored to the descendants of Władysław II the Exile in 1163, and Lubusz Land together with Lower Silesia was given to his eldest son Bolesław I the Tall.