Middle Silesia

Middle Silesia (Polish: Śląsk środkowy, German: Mittelschlesien) was a colloquial designation for the Regierungsbezirk Breslau subdivision in the Prussian province of Silesia from 1813 to 1945. It comprised the eastern parts of the historic Lower Silesia region and the former County of Kladsko, both conquered by Prussia in 1742.

Silesia had been part of Bohemian crown lands of the Habsburg Monarchy until most of it was annexed by the Prussian king Frederick the Great in the First Silesian War, codified by the 1742 Treaty of Breslau. In 1813, the administrative Regierungsbezirk was established in Prussian Silesia, with its capital in Breslau (present-day Wrocław). The western half of Lower Silesia was incorporated into Regierungsbezirk Liegnitz (Legnica), the adjacent Upper Silesian land in the east into Regierungsbezirk Oppeln (Opole).

After in 1820 the short-lived Regierungsbezirk Reichenbach (Dzierżoniów) was dissolved, the Middle Silesian district also comprised Glatzer Land (Kłodzko Land) in the south and several districts of the former duchies of Münsterberg (Ziębice), Jauer (Jawor) and Brieg (Brzeg). It then stretched from the Greater Polish plain in the north (Grand Duchy of Posen) to the border with Bohemia along the Sudetes mountain range in the south, where Glatzer Land also bordered on Austrian Silesia in the east.

...
Wikipedia