Kastrophylax (Greek: 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.

References

• Mark C. Bartusis (1992). The Late Byzantine Army: Arms and Society, 1204-1453. Penn, University of Pennsylvania Press. ISBN 978-0-8122-3179-3.
• Clifford J. Rogers; Kelly DeVries; John France (1 September 2013). Journal of Medieval Military History. Boydell & Brewer Ltd. pp. 180–. ISBN 978-1-84383-860-9.