Geospatial Approaches to Intervisibility and Communication within the Byzantine Fire Beacon System

This research employs Geographic Information System (GIS) methodologies to analyze the spatial relations and operational efficiency of the 9th-century Byzantine fire signaling beacons. Some of these beacon towers still exist in fragmentary archaeological assemblages across central Anatolia, while others currently remain unidentified. The beacon network originated from the Taurus mountains, and ended near Constantinople, ensuring communication across the expanse of the Anatolia plateau. Specifically, this research tests the hypothesis that site elevation, viewshed, and intervisibility demonstrate a statistically significant correlation among potential beacon locations. Digital Elevation Models (DEMs) were generated in ArcGIS Pro to extract elevation and topographic data. Intervisibility and viewshed analyses were conducted to evaluate the optical communication capabilities of known beacon sites. Results of the spatial analysis provide insight into the efficiency of optical communication systems in the Late Antique and Early Medieval world, revealing that fortress architects strategically selected locations based on visibility, resource availability, and terrain, emphasizing landscape control beyond simple enemy detection. Elevation data, ranging from 428 to 2400 meters, demonstrate the network's adaptation to diverse terrain, influencing both defensive tactics and signal transmission efficiency. These findings reframe the frontier as a dynamic socio-geographic space of social integration and power projection, rather than a mere peripheral outpost. The Byzantine network reflects a strategic balance between natural terrain and communication needs, showcasing adaptive medieval infrastructure engineering that innovated beyond mere replication of past technologies.