Herzogtum Glogau
John was born into the Schelling family in Głogów (in German, Glogau) in the Lower Silesian Duchy of Głogów, which from 1331 had belonged to Bohemia and thus, during his lifetime, to the Holy Roman Empire. He variously styled himself "Johannes Glogoviensis", "Glogerus", "de Glogovia" and "Glogowita"; but while he may have been of German extraction, he never used the name "Schelling."