A bit feeble, but yes, that's what I meant (and personally the way I would personally go if I were to make him a Servant profile). Also it would make some sort of connection with this quote from wikipedia «Faceva pił danno alli inimici lui solo che tucto lo exercito.».
In other words, he has the presence and the affinity of a Devil who scares even the "godless - "demonic" - barbarians" who went against and sieged Rome.