“…For instance, the similarity of the exterior of the palace to some tetrarchic forts would have given the structure the aura of military power, intensified by the presence of soldiers to guard the senior Augustus, despite its essential lack of defensibility (Wilkes 1986, pp. 69-71;Mackensen 2003Mackensen , 2006Mackensen , 2009Constantine Porphyrogenitus, De Administrando Imperii, 29.138).…”