sentences:  Temporarily recreated in 1807 by Napoleon as a gift for his ally Jean Lannes within the Duchy of Warsaw, after the 1815 Congress of Vienna the lands became part of Congress Poland under Imperial Russian rule.In 1918, Siewierz became part of the Second Polish Republic, from 1939 to 1945 it was occupied by Nazi Germany.The bishops of Kraków continued to use the title of a "Prince of Siewierz" until the death of Adam Stefan Sapieha in 1951.