The first documents of Baena Castle date at the beginning of the 9th century (890), during the reign of Emir Ahdullah, whose Governor in Regio since 889 had been Omar Ben Hafsum who rebelled and took Baena in 891.
In 1228, the governor of Fernando III in Baeza attacked the castle, belonging then to Seville. Subsequently the castle was attacked by Mohamed, the king of Granada, 1297. In July 1320 a peace treaty was signed in this castle between the Alonso XI and Ismail, King of Granada, which guaranteed this peace for eight years. In 1332, this same Alfonso XI garrisoned the castle in the face of danger from Granada, and in 1341 he left Baena to attack the Nasrid kingdom, not before providing the fortress with men and materials. In 1362 Abu Said, King of Granada, the Bermejo, took refuge in Baena and was accompanied to Seville by people from Cordoba.
In 1401 the castle was ceded by Henry III to the Marshal, Don Diego Fernández de Córdoba, with the opposition of the inhabitants of the city, taking possession of it in 1438.
Since the 16th century it has been used as the Palacio de los Duques. Diego Fernández de Córdoba, III Conde de Cabra, established his residence in the castle at the beginning of the 16th century and gave it a more palatial character. In 1520 the Baena and Condado de Cabra estate became related by marriage to the Duchy of Sessa. En 1566, by a Royal Decree of Philip II, Baena became the Duchy of Baena whereupon the lords of Baena came to be the Dukes of Sessa and Baena. It is from that time when there began to be a succession of structural changes in the fortified enclosure aimed at making the place suitable as a residence, and the military character of the complex faded into the background.
Baena Castle is square and still has part of its original walls and three of the four towers located in those of: El Secreto, Los Cascabeles and the last one of the Cinco Esquinas or Las Arqueras.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.