Duchy of Głogów
In the Middle Ages the area was settled by Slavs. It formed part of Poland since its establishment in the 10th century and after the fragmentation of Poland it was part of various duchies ruled by the Polish Piast dynasty, the last being the Duchy of Głogów until 1476. By 1538 the area was part of the Margraviate of Brandenburg. Until 1476 it was part of the historic region of Silesia.