Castillo de la Villa, also known as Fortaleza Baja, is an urban castle in Martos, Jaén, situated on a rocky hill with occupation dating to prehistoric times. The fortress occupies the site of the Ibero-Roman acropolis of Tucci, later converted into an Islamic fortification (hisn), and finally into a medieval Christian castle. Built with support from the Order of Calatrava as a key defense against the Kingdom of Granada, the castle features a 13th-century keep and the imposing Almedina Tower with a square floorplan spanning three superimposed floors and a basement. Declared a Historic Monument in 1985, the castle's remains offer spectacular views across the city of Martos from the keep. Currently undergoing recovery efforts, the fortress represents continuous occupation and strategic importance across multiple civilizations, from Roman times through the medieval period.