sentences:  As ruler of Sandomierz, Henry appears only on the occasion of the Act of Foundation of a Church in his land.His ducal title was rarely mentioned by the chronicles, who called him "a son of Bolesław III Wrymouth" or "brother of Bolesław IV the Curly".Some historians (for example M. Gładysz and D. Guttner) advance a hypothesis that he was the “King of the Poles” mentioned by the Greek chronicler John Kinnamos.