In a similar way , the Privilegium maius elevated the duchy into an Archduchy of Austria .
It was essentially a modified version of the Privilegium minus issued by Emperor Frederick I Barbarossa in 1156 , which had elevated the former March of Austria into a duchy .
In a similar way , the Privilegium   elevated the duchy into an Archduchy of Austria .
It was essentially a modified version of the Privilegium minus issued by Emperor Frederick I Barbarossa in 1156 , which had elevated the former March of Austria into a duchy .