In the second half of the 2nd millennium B.C. (late Bronze Age) Silesia belonged to the Lusatian culture. About 500 BC Scyths arrived, and later Celts in the South and Southwest. During the 1st century BC Silingi and other Germanic people settled in Silesia. For this period we have written reports of antique authors who included the area. Slavs arrived in this territory around the 6th century. The first known states in Silesia were those of Greater Moravia and Bohemia. In the 10th century, Mieszko I incorporated Silesia into the Polish state. It remained part of Poland until the Fragmentation of Poland. Afterwards it was divided between Piast dukes, descendants of Władysław II the Exile, High Duke of Poland.
In the Middle Ages, Silesia was divided among many duchies ruled by various dukes of the Piast dynasty. During this time, cultural and ethnic German influence increased due to immigrants from the German-speaking components of the Holy Roman Empire. Between the years 1289–1292 Bohemian king Wenceslaus II became suzerain of some Upper Silesian duchies. Silesia subsequently became a possession of the Crown of Bohemia under the Holy Roman Empire in the 14th century, and passed with that Crown to the Habsburg Monarchy in 1526. The Duchy of Crossen was inherited by Margraviate of Brandenburg in 1476 and, with the renunciation by King Ferdinand I and estates of Bohemia in 1538, it became an integral part of Brandenburg.