At the same time the Polan duke of the later Kingdom of Poland raised claims to the Lusatian lands and upon the death of Emperor Otto III in 1002, Margrave Gero II lost Lusatia to the Polish Duke Boleslaw I the Brave, who took the region in his conquests, acknowledged by Henry II first in the same year in Merseburg and later in the 1018 Peace of Bautzen, Lusatia became part of his territory; however, Germans and Poles continued to struggle over the administration of the region. It was regained in a 1031 campaign by Emperor Conrad II in favour of the Saxon German rulers of the Meissen House of Wettin and the Ascanian margraves of Brandenburg, who purchased the March of (Lower) Lusatia in 1303.