The German–Polish War consisted of a series of struggles in 1003–1018, between the Ottonian king Henry II of Germany (Holy Roman Emperor from 1014) and the Polish Piast ruler Bolesław I the Brave. The locus of conflict was the control of Lusatia, Upper Lusatia, as well as Bohemia, Moravia and Slovakia. The fighting ended with the Peace of Bautzen in 1018, which left Lusatia and Upper Lusatia as a fief of Poland, and Bohemia became a duchy in the Holy Roman Empire.