The castle-palace of Belalcázar is one of the most representative of the 15th century, when the nobility attempted to demonstrate its social and economic status.
Built entirely of stone blocks, Belalcazar preserves two enclosures: an outer barrier adapted to the irregularities of the land and reinforced with rectangular towers, and the inner rectangular castle-palace with eight towers, one at each corner and another in the center of each side. All eight towers are of average height except for the eastern and principal tower, which rises noticeably above the rest.
In the 15th century, some Renaissance construction was added to improve the accommodations of the palace, which were insufficient in the old principal tower.The castle was built by the magnate Gutierre de Sotomayor, grand master of Alcantara, with the benefices he earned from his various possessions. The castle later passed on to the houses of Benavente and Osuna. In 1811, during the War of Independence, French troops defended the castle against a siege by the duke of Wellington's British troops.The exterior of the fortress is almost entirely intact, but nothing remains of the interior structure.
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.