Polemius is the Greek equivalent of Bellator ('warrior'), from Greek 'polemos' or Latin 'bellum.' It could be (though I have no evidence, this is only a working hypothesis) an assumed Christian name, such as 'stercorarius', 'asellus', etc. Bellator was one of the translators of Cassiodorus' team at Vivarium. By the by, why were Chrysanthus and Daria 'supposed'? Their relics were considered real enough to be translated to Muenstereifel in the 9th century - was it all a fake? Thanks,