Castillo de Alcaudete was built by the Arabs over the remains of a previous Roman fortification and taken by the Christians in 1085 during the reign of Alfonso VI. For almost three hundred years thereafter, the castle kept changing hands until 1340 when the Christians took it over.
The design is polygon in shape, adjusted to the terrain escarpments. The structure is surmounted by six towers, including the Tower of Homage, which has a door on the north side, guarded by two additional towers.
Today it has become a tourism-cultural space which houses the Interpretation Centre on the life of the Military Order of Calatrava. Visitors will go back to the 13th century to discover the construction of a castle on the border with the Nasrid Kingdom, the lifestyle and internal structure of the Order, the military armament used for the assault and defence of a fortress.
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.