Vratislaus II of Bohemia
Nevertheless, the "Land Budissin", later called Upper Lusatia, was reconquered by Emperor Conrad II in 1031 and again held by the Meissen margraves until King Henry IV of Germany in 1071 enfeoffed Duke Vratislaus II of Bohemia, his ally in the looming Saxon Rebellion. The Bohemian rule was again confirmed by Emperor Frederick Barbarossa in favour of Duke Vladislaus II in 1158, accompanied by the royal title. Meanwhile, the territory east of the Kwisa had been incorporated into the Polish Duchy of Silesia in 1138, which after the Emperor's 1163 expedition to Poland was held by the Silesian Piast descendants of Duke Władysław II the Exile. From that time on the river marked the border between the historical regions of Lower Silesia—i.e. the Duchy of Legnica from 1248, the Duchy of Jawor from 1274—in the east and Upper Lusatia in the west.