Castle of La Concepción, Cartagena

The Castle of La Concepción stands on a hill overlooking the city of Cartagena in Spain. This fortress dates back to the medieval period and was built by Christian forces during the Reconquista in the 13th century.

Before the castle’s construction, the hill held significance dating to antiquity. The Greek historian Polybius recorded the existence of a Roman temple dedicated to Asclepius, the god of healing, on this site. Archaeological work has shown that the earliest level of the castle reused Roman cisterns, possibly connected to this temple or to a later Byzantine-era structure. During the 12th century, the hill was fortified by Muslim rulers with an alcazaba, a type of fortress. Portions of the castle’s walls and a lantern tower, used as a lighthouse during the Islamic period, remain from this time.

In the mid-13th century, following the Christian reconquest of Cartagena by Infante Alfonso X of Castile, known as Alfonso X the Wise, the castle was built over the earlier Muslim defenses. Alfonso X strengthened the city’s fortifications, establishing Cartagena as the Crown of Castile’s only Mediterranean port. This location made the castle strategically important, situated between the Crown of Aragon and the Nasrid Kingdom of Granada. Alfonso X also revived the bishopric of Cartagena and founded the Order of Santa María de España within the city to combat Muslim naval forces. However, after several military setbacks and losses at sea, the order was suppressed, reducing the port’s military role and leading to the castle’s incomplete construction.

The main entrance, known as the Puerta de la Villa, consisted of a large arched gateway flanked by two towers guarding access to the walled enclosure. Over time, as Cartagena’s military significance waned, the castle fell into decay. In the early 20th century, plans to demolish the fortress were considered but never carried out. During the dictatorship of Primo de Rivera, the site was transformed into a public park featuring gardens and ponds, acquiring the local nickname “castle of the ducks.” More recently, the castle’s keep has been partially restored and repurposed as a center for historical interpretation by local heritage organizations.