Roman Numeral Practice: http://www.factmonster.com/math/roman-numeral-game.html
10 Things you may not know about Roman gladiators: http://www.history.com/news/history-lists/10-things-you-may-not-know-about-roman-gladiators
Video - Teenage Life in Ancient Rome (TED-ed): http://www.youtube.com/watch?v=juWYhMoDTN0