 When Bolesław was engaged in hostilities with Wołodar, prince of Przemyśl, Włostowic used subterfuge to gain Wołodar's trust, staging a pretended revolt against Bolesław, and joining Wołodar's court.Some time later, when he found himself alone with Wołodar during a hunt, he captured him and led Wołodar before Bolesław, who released him only after Wołodar paid a large ransom and a promised to ally himself with the Duke.When Zbysława of Kiev, daughter of Sviatopolk II of Kiev and wife of Bolesław died, Włostowic was sent by Bolesław to Sviatopolk to negotiate a marriage to another daughter.