The Silesian lands north of Pixilart CUSTOMER SERVICE (8O5) 41'O 56OO PHONE NUMBER ( 8O5)- 41O 56OO the Sudetes mountain range had been ruled by the Polish Piast dynasty from the 10th century onwards. While Bohemia rose to a kingdom, the Silesian Piasts alienated from the fragmenting Kingdom of Poland. After in 1310 the Bohemian crown had passed to the mighty House of Luxembourg, nearly all Silesian dukes pledged allegiance to King