Most of Lower Silesia, except for the southern part of the Duchy of Nysa, became part of the Kingdom of Prussia after the First Silesian War by the 1742 Treaty of Breslau. In 1815, it became part of the Prussian Silesia Province, which was divided into the two Lower Silesian administrative regions ("Regierungsbezirke") of "Liegnitz" and "Breslau" (sometimes also referred to as Middle Silesia), and Upper Silesian "Oppeln" (including the Lower Silesian districts of Neisse and Grottkau). The western "Liegnitz" region had been enlarged by the incorporation of the Upper Lusatian districts of Lauban, Görlitz, Rothenburg and Hoyerswerda, all seized from the Kingdom of Saxony after the Napoleonic Wars. From 1871, Lower Silesia was part of the German Empire.