 Complete the following phrase:  Silesian tribes settled the lands at the end of the first millennium after the Migration Period. During the period of Germania Slavica, the region became part of Great Moravia under Svatopluk I of Moravia. Mieszko I brought the various existing Silesian duchies under the rule of the Piast dynasty and they became the Duchy of Silesia. It was again divided into small realms reigned by Silesian branches of Piast princes after the testament of Bolesław III Wrymouth in 1138. With the Ostsiedlung, the cultural and ethnic Germanic influence grew with an influx of immigrants from the German-speaking areas of the Holy Roman Empire, of which Silesia was a direct part until the 1330s when it was subjugated to the Kingdom of Bohemia, then together with it became part of the Habsburg Monarchy 1526, then the Kingdom of Prussia 174244, and subsequently the German Empire 1871. In 1945, Lower Silesia was made part of Poland as agreed at the post-war Potsdam Conference. As a consequence, Lower Silesia suffered a nearly total loss of its pre-war population between 1945 and 1950. Polish citizens dispossessed by the Soviets were then 