Villafuerte Castle was erected in the 15th century, forming pat of the defensive line drawn alongside of the river. Its first lord was García Franco, a Jew who later on converted to Christianity. It might have been built in order to control his properties.
Its layout is of the so-called 'tower castle'; an almost square, small enclosure with round towers (with a 3-meter diameter) at 3 corners and the keep at the 4th, much like other castles such as Torrelobatón Castle. The keep which has lost its crenellations, consists of 5 floors; 2 vaulted and 3 wooden ones. All the floors communicate by one narrow, spiral wall staircase. The entrance to the keep is through a doorway, on a height of 7 meters, which could be reached by another spiral staircase from the courtyard and a movable wooden footbridge. The tower has been restored and furnished. Today it houses a museum.
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.