Expansionism
Vratislaus coveted the largely Slavic marches of Meissen and Lusatia, but, in spite of Henry's promises and Bohemian successes against the rebellious margraves, he never received them. He held Lower Lusatia between 1075 and 1086, but in 1088, with the insurrection of Egbert II of Meissen, Henry granted the region to Henry of Ostmark. Vratislaus was thereafter cool to Henry's military adventures. He never wavered in his loyalty, but he abstained from giving the emperor martial aid.
Read more about this topic: Vratislaus II Of Bohemia