Duke Bolesław I of Poland of the Piast dynasty repeatedly clashed with Emperor Henry II during the German-Polish Wars of 1002 to 1018. In January 1018, Henry II and Bolesław I signed the peace treaty of Bautzen, that settled the permanent coexistence of the Empire and Poland as Bolesław recognized Henry II as his nominal feudal lord. In return, Henry II generously invested Bolesław with territorial properties at the Empire's eastern border. In order to reinforce his dynastic bonds with the German nobility, Bolesław, a widower, married Oda of Meissen, daughter of the Saxon Margrave Eckard I of Meissen. The Empire and Poland endured peace for the remainder of Henry's reign. Bolesław seized the opportunity of Henry's death in 1024 to disregard all peace agreements and consolidate his own power. Bolesław took advantage of the interregnum in Germany and crowned himself King at Easter, April 25, 1025. Bolesław was thus the first Polish king as his predecessors only held the ducal title of the political entity, so far called Civitas Schinesghe, that had only a few decades ago revealed itself to the world and the Holy See in Rome. Bolesław died within two months of his coronation, most likely due to an illness. His son, Mieszko II Lambert succeeded him as King, crowned at Christmas in 1025. Upon assuming the Polish throne, Mieszko expelled his older half-brother Bezprym and his younger brother Otto Bolesławowic. Otto went west to seek Conrad II's protection.