Surely they should only be judged by the standards of the times anyway? In my book I deliberately compare the (largely unknown) Celtic view of violence and death with that of the (much better documented) Romans. (Obviously I have had to create Celtic attitudes from scratch, but I based it on as much evidence as I could gather) Towards the end of the story, some of the Celts are horrified by the barbarism, and also weakness, of the Romans. I did that because I believe every culture sees the bad in others but not in themselves.