Duchy of Jawor
Eastern parts of Upper Lusatia also formed part of Silesia in the early 14th century, as part of the Duchy of Jawor of fragmented Poland, and again from 1815 to 1945, when the area was annexed from Saxony by Prussia and included within the Province of Silesia and later of Lower Silesia. During this time Silesian culture and the Silesian German dialect spread into this region with its centre Görlitz. The expulsion of the Germans from the east of the Oder-Neisse line led to an additional settlement of German Silesians in this region.