Herzogtum Glogau
In 1329, Władysław I the Elbow-high started a war with the Teutonic Order. The Order was supported by John of Bohemia who managed to enforce his supremacy over the dukes of Masovia and Lower Silesia. In April–May 1329, following Lower Silesian duchies became subjects of the Bohemian crown: Ścinawa, Oleśnica, Żagań, Legnica-Brzeg and Jawor. In 1331 the Duchy of Głogów separated from Poland as well.