Súľov Castle was built in first third of the 15th century. By it’s size, the castle was very small. Its main function was to protect and watching near by road. After 1550 fire it was rebuilt to its original shape and size. In 1730 the castle heads military garrison. There used to be upper and lower castle. Heavy earthquake damage in 1763 accelerated its final destruction. Fortified formation was found in the Súlov castle village area dating from 12th to 13th century.
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.