Margravate of Meissen the occasion to conquer the margravial lands east of the Elbe and demanded the surrender of Meissen. The following German–Polish War ended with the 1018 Peace of Bautzen, whereby Meissen had to cede the Milceni region (later Upper Lusatia) to Poland. In 1031 however, King Conrad II of Germany was able to reconquer the Milceni lands, which were returned to Meissen. In 1046, Count Otto of Weimar-Orlamünde became margrave, followed by Egbert II of the Brunonids upon his death in 1067. Egbert II entered into a longstanding conflict with Emperor Henry IV, because of which he had to renounce the
Meissen porcelain At the same time, Ehrenfried Walther von Tschirnhaus, a mathematician and scientist, experimented with the manufacture of glass, trying to make porcelain as well. Tschirnhaus supervised Böttger and by 1707 Böttger reluctantly started to help in the experiments by Tschirnhaus. When Tschirnhaus suddenly died, the recipe apparently was handed over to Böttger, who within one week announced to the King that he could make porcelain. Böttger refined the formula and with some Dutch co-workers, experienced in firing and painting tiles, the stage was set for the manufacturing of porcelain. In 1709, the King established the "Royal-Polish and Electoral-Saxon Porcelain Manufactory"