“ The duchy was nominally retained by the emperors in their own hands until 1115, when the emperor Henry V., wishing to curb the episcopal influence in this neighbourhood, appointed his nephew Conrad of Hohenstaufen as duke of Franconia. Conrad’s son Frederick took the title of duke of Rothenburg instead of duke of Franconia, but in 1196, on the death of Conrad of Hohenstaufen, son of the emperor Frederick I., the title fell into disuse. ”

“ After the treaty of Verdun in 843 it became the centre of the East Frankish or German kingdom, and in theory remained so for a long period, and was for a time the most important of the duchies which arose on the ruins of the Carolingian empire. ”