I would like to focus my paper on several words belonging to the sphere of the “Sacred” as translated from Latin into Greek by Cassius Dio. Actually, the Severian historian has to translate, that is, to explain to Greek-speaking or -thinking readers terms like sacer, sacrosanctus (especially for the tribunician power), and augustus (particularly in connection with the name of the first emperor). We shall see that Cassius Dio knows very well the exact meaning of each and every one of these Latin words, but often distances himself from traditional Roman beliefs.