波列斯瓦夫一世
A first fortress near the strategically important Brynica River on the road from Bytom to Częstochowa was erected in the 11th century at the behest of the Polish king Bolesław I Chrobry. In 1179 High Duke Casimir II the Just gave it to the Racibórz duke Mieszko IV Tanglefoot. After the Racibórz line of the Silesian Piasts had become extinct in 1336, Świerklaniec passed to the Dukes of Teschen and the castle was largely rebuilt under the rule of Duke Konrad II the Gray of Oels.