 Historian Sandra Mass considers the Rommel myth a hero cult, a synthesis of old and new hero cults and traditions culled primarily from Germany's largely imaginary colonial past, in particular the proletarian hero cult originally represented by Carl Peters and the bourgeois one represented by Paul von Lettow-Vorbeck.Rommel, as portrayed by this hero cult, was both chivalrous and ruthless, young and old, harsh and gentle, strong and righteous.Calder, Duffy and Ricci opine that Rommel's military brilliance provoked a masochistic tendency to romanticise a worthy opponent, that because he was skilled at his profession, he must have been an anti-Nazi hero.