Most other medieval German rulers are all but forgotten, so why has interest in the Hohenstaufen never completely disappeared. They were by no means the most successful emperors, that crown has to go the Ottonians, nor was their reign the most fateful, that award goes to the later Salians. Frederick Barbarossa and his grandson Frederick II have been such fascinating personalities that almost any age could project their own perceptions and expectations onto them, from champion of national uni ...