Mario J.A. Bartolini is a retired political analyst and officer in the Canadian army reserve, with a long-held interest in Roman military history. He has a bachelor’s and a master’s degree in political history from the Université de Sherbrooke, Canada, and a second master’s degree in war studies, obtained at the Royal Military College of Canada. He lives in Ottawa. He is the author of Roman Emperors: A Guide to the Men Who Ruled the Empire