"Trebian" is the internet handle of Graham Evans. Graham Evans is the author of "The Battle of Edgcote 1469 - Re-evaluating the evidence", and co-author of "The Battles and Battlefields of Northamptonshire" with Mike Ingram. He is Chair of the Northamptonshire Battlefields Society and edits their quarterly newsletter. He has a degree in Modern and Medieval History from the University of Sheffield.
He is also well known as a wargamer and wargame rule designer and blogger: Wargaming for Grown Ups