Who was the King of Poland during the 1100's?
Kingdom of Poland (1025–1385)
Duke Bolesław III the Wrymouth, who reigned from 1102 to 1138, tried to end the repeated struggles between various claimants by setting the government of Poland on a more formal footing. In his testament, he divided his lands into five Duchies and distributed them among his sons.
History of Poland during the Piast dynasty
After Bolesław's exile, the country found itself under the unstable rule of his younger brother Władysław I Herman (r. 1079–1102). Władysław was strongly dependent on Count Palatine Sieciech, an advisor from the ranks of the Polish nobility who acted much as the power behind the throne. When Władysław's two sons, Zbigniew and Bolesław, finally forced Władysław to remove his hated protégé, Poland was divided among the three of them from 1098, and after the father's death, from 1102 to 1106, it was divided between the two brothers.