Dr Ross Cowan graduated from the University of Glasgow with a Ph.D. on the Praetorian Guard and Second Parthian Legion. Now a freelance writer and historian, Dr Cowan has published five books and numerous articles on all aspects of warfare in the Roman World.Seán Ó’Brógáin lives and works in Donegal, Ireland. He has a BA (Hons) in scientific and natural history illustration from Blackpool and Fylde College (Lancaster University).