Assessing the Defensibility of Medieval Fortresses on the Mediterranean Coast: A Study of Algerian and Spanish Territories

Abstract

This study focuses on assessing the defensiveness of medieval fortresses situated along the Mediterranean coast, including the Northern Algerian coast and Southeastern Spain. The proposed methodology involved a two-fold process comprising identification and evaluation. Initially, we identified and geolocated our case studies, deriving their locations from archival sources. We then seamlessly integrated them into a Geographic Information System (GIS) for precise georeferencing on a rasterized landscape. Subsequently, we conducted assessments of visibility, intervisibility, and elevation, which we consider pivotal in determining the degree of defensibility of the fortified sites. Specifically, the aim of this research was to investigate the intricate relationship between natural landscapes and architectural defensive features, with a focus on discerning the influence that the chosen location has on the strategic and defensive significance of the studied fortresses. Our findings reveal that the evolution of those defensive systems within our study context is intricately tied to the physical elements comprising the landscape. These natural constituents have served as a foundation for the architectural and defensive characteristics adopted by medieval builders. Furthermore, we delineated two distinct typologies: the isolated type, intentionally designed to obscure visibility, and the exposed type, characterized by a higher visibility index.