Coria Castle was constructed by architect Juan Carrera, between 1473 and 1478, by order of García Álvarez de Toledo (died 1488), Duke of Alba and first Marquis of Coria. Located to the northwest of the Roman City Walls, this work of military engineering was constructed in place of another fortification occupied by the Knights Templar in the 12th century. It has an irregular pentagon layout, like a starling, which projects from the walled enclosure and was built with fine masonry of perfectly dressed and squared granite ashlars.
The Keep is completed by what is popularly known as Castillejo: a small crenellated structure within the city walls that is equipped with a bent entrance and a drawbridge. It was defended through a circular casemate tower and an extensive moat constructed by Tomás Bretón in 1473, which is partially visible today. Crowning the entire fortified complex is the continuous band of the cornice of balls or knobs placed in the blind arches over the corbels surrounding the entire perimeter of the battlements in the Late-Gothic or Elizabethan style.
Today, the interior of the Castle of the Dukes of Alba is not open to the public since it is private property, however, visitors can explore its surrounding area or exterior space.
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.