Integration of the newly annexed lands enabled Bolesław to build churches and began the process of converting Pomerania.
Bishop Otto of Bamberg confirmed the Christianization of Pomerania from 1123 onward.
The resolution of the conflict with the Holy Roman Empire allowed Bolesław to subordinate Western Pomerania and incorporate Gdańsk Pomerania.The military expeditions, carried out in three stages, ended in the 1120s with military and political successes.He also upheld the independence of the Polish archbishopric of Gniezno, despite a temporary failure in the 1130s.Despite undoubted successes, he committed serious political errors, most notably against Zbigniew of Poland, his half-brother.The Congress of Merseburg of 1135 addressed the issues of Pomerania, Silesian (probably also Polish) sovereignty and the supremacy of the Archbishopric of Magdeburg over the Polish Church. His first marriage with the Kievan princess Zbyslava gave him an excuse to intervene militarily in the internal affairs of Russia.
After her death, Bolesław married to a German noblewoman, Salomea of Berg, which in some way was the cause of changes in Polish foreign policy: in the second half of his rule, the Prince sought to restore diplomatic relations with his western neighbor.
The crime against Zbigniew and his penance for it show Bolesław’s great ambition as well as his ability to find political compromise.
Therefore, that same year Władysław I was forced to recall from Hungarian banishment the only son of Bolesław II the Bold and a rightful heir to the Polish throne, Mieszko Bolesławowic.
Backed by their father, Boleslaw and his half-brother Zbigniew finally expelled Sieciech from the country in 1101, after several years of fighting.
After the death of Władysław I Herman in 1102, two independent states were created ruled by Bolesław and Zbigniew.
Upon his return young Bolesławowic accepted the over-lordship of his uncle and gave up his hereditary claim to the crown of Poland in exchange for becoming first in line to succeed him.