sentences:  Archaeological discoveries have shown that there was a fortified settlement (a "gród") here, probably founded by the Polish King Bolesław I the Brave in the early 11th century.After the fragmentation of Poland in 1138, Bytom became part of the Seniorate Province, as it was still considered part of historic Lesser Poland.In 1177 it became part of the Silesian province of Poland, and remained within historic Silesia since.