sentences:  According to the Testament of his father, Henry inherited the Duchy of Sandomierz, which was at that time in the Seniorate Province of his eldest half-brother and High Duke, Władysław II.Because at the time of Bolesław III's death he was still a minor (1138) the Duchy remained in the Seniorate until he reached the proper age, when Władysław had to given him.But Henry could take formal possession of Sandomierz only when the High Duke was deposed and exiled, in 1146.