05-01-2007, 09:21 PM
Roma Victrix is grammatically correct if you want to say "Rome the Conqueror" or "Rome Victorious"... but I don't know of any ancient attestations of the phrase. You'll want to stay away from "Roma Victa" unless you're a Samnite, Celt, Etruscan, Greek, German, Parthian, etc.
Dan Diffendale
Ph.D. candidate, University of Michigan
Ph.D. candidate, University of Michigan