This work deal with the complete analysis of a building system, conceived from the beginning as a system, chronological, typological and technologically bounded, which crosses Castilla y León completely from north to south, venturing into Extremadura along successive border lines agreed between the kingdoms of Leon and Castillla in the twelfth and thirteenth centuries, and in some cases at the borders of Portugal.

The scientific characterization of this Territorial Heritage Systems (THS), part of the premises established for the recognition of systems and in this case specifically for the systems which have been named as Systems of Inherent Character, analyzing the common aspects of this set of 29 fortifications from the historical, typological and constructive point of view..

Location: Border lines between the Kingdom of León with Castilla and Portugal between 1157 and 1230
Promoter: Junta de Castilla y León
Prime contractor: Fernando Cobos Estudio Arquitectura
Year of implementation: december 2009
Team: F. Cobos, director architecte, R. Canal, architect, R. Retuerce, historian, JJ. de Castro and JA. Pérez, collaborators