Tyranni.----By this name certain commanders of armies in various Roman provinces were called, who, in the disordered and tumultuous reigns of Valerianus and Gallienus, usurped the augustal titles, and exercised "a little brief authority", as Caesars and as Emperors. Trebellius Pollio professed to write the history of "The Thirty Tyrants", as they are commonly called, but who are scarcely known except from coins. And of these Odenathus, Macrianus, Quietus, Postumus, Victorinus, Tetricus I and his son Tetricus II, Regalianus, Domitius Domitianus, and a few others, are the only ones of whom medals are extant, which antiquaries agree in recognizing as genuine.----See Rasche.