Photo-Illustration: Vulture; Photos: Everett Collection (Aidan Monaghan/Paramount Pictures, Caitlin Cronenberg/TriStar Pictures) In the days of the Roman Empire, plebeians and patricians alike entertained themselves by watching men fight to the death. Some two millennia later, we’re much more civilized; we entertain ourselves by watching movies where men fight to the death. Audiences are returning to the Colosseum with the release of Gladiator II , the latest in a subgenre that dates back to