The medieval city walls of Almeria have abundant references in Arabic sources and numerous preserved remains, either in all its elevation, or as small archaeological remains on the current slope and even under the ground. This circumstance has given rise to a lot of scientific literature on the chronology of each of the different existing precincts: Alcazaba, Medina, suburbs and outer enclosure. The problem lies in the fact that, since its foundation in the tenth century until the conquest by the Catholic Monarchs in 1489 and its reuse until the mid-nineteenth century, the medieval walls have undergone various repairs, extensions and reconstructions. In order to provide greater chronological precision, from the School of Arab Studies (CSIC), a Project of the State Research Plan was requested, which was granted with reference HAR2015-71609-P. It has allowed to make radiocarbon dating of wood and other building materials of the walls, in combination with studies of construction, metrological, historical techniques and restorations carried out since the mid-twentieth century. All this has allowed us to contribute new hypotheses about the chronology of the preserved remains, many of which are much more recent than the foundational walls that they have replaced.