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 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).