 In the 14th century, it became a constituent part of the Bohemian Crown Lands under the Holy Roman Empire, which passed to the Austrian Habsburg Monarchy in 1526.As a result of the Silesian Wars, the region was annexed by Prussia in 1742.After World War I, the easternmost part of Upper Silesia was granted to Poland by the Entente Powers after insurrections by Poles and the Upper Silesian plebiscite.