Originally, the Monastery of St. Georg was within the fortress, but in 1005 it was moved to Stein am Rhein (now in Switzerland), and the Swabian dukes lost control of Hohentwiel.
Oprindelig lå klosteret St. Georg indenfor fæstningen, men i 1005 blev det flyttet til Stein am Rhein (i dag i Schweiz} og de schwabiske hertuger mistede kontrollen over Hohentwiel.