Duchy of Głogów
It was formed in 1274 from the western part of the Duchy of Głogów and existed under Piast rule until 1304, then again from 1322 to 1394 and from 1413 to 1472. Since 1329 it was under the suzerainty of Bohemia; it was acquired by the Saxon House of Wettin in 1472, before it was finally seized by the Bohemian king in 1549.