Fuensaldaña Castle construction started in the 13th century, but it is not until the 15th century that the structure acquires today's configuration. It was built by the Vivero family. The family became linked to the region's history when the future Catholic Monarchs got married in their castle.
Inside, the building was shaped as a 'U' around the cortyard, which today has been made into the parliament floor. During the Comunidades war, it was peacefully occupied by the comunero troops. The castle was the General Assembly of Castilla y León.
Inside the keep are four vaulted halls out of ashlar masonry. The keep, like the curtain walls, is also equipped with round towers at its corners, two nice turrets and battlements.
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.