The article discusses the use of the term diegesis in Plato’s Republic as a fundamental principle of a poetics of narrative, relating it with the concept of pure freedom (ákratos eleuthería) in Lucian of Samosata. Considering both parameters, it explores the status of the narrator (diegetés) and his tyrannical power, i.e. the ability to report both the credible and the unbelievable.