Kastrophylax (καστροφύλαξ, "fortress guard" or "fortress warden") was a late Byzantine local official who served as the assistant of the kephale (provincial governor) in maintaining the defense of a fortified city (kastron) and its guard service.
Book: Clifford J. Rogers. Kelly DeVries. John France. Journal of Medieval Military History. 1 September 2013. Boydell & Brewer Ltd. 978-1-84383-860-9. 180–.
