The aim of this paper is to analyze the traces of the first military constructions met by the Almoravids (the ones located in Sijilmasa) in the walls of Marrakech and Al-Andalus. In this way, the Saharan influence in the Almoravid military architecture has been documented. This influence has been still present during the first half of the 12th century (at least until 1126), when the Almoravid walls were built and repaired.El objetivo de este artículo es analizar la huella de las primeras construcciones militares conocidas por los almorávides (siendo éstas las localizadas en la ciudad de Siyilmasa) en las murallas de Marrakech y al-Andalus. De este modo, se ha podido documentar la influencia sahariana en la arquitectura militar almorávide...