In 1459 the market town of Poběžovice was bought by a lower nobleman Dobrohost of Drštka by Skořice na Rokycansku. At the latest in 1470, he left the keep and had built a late-Gothic solid water castle called Nový Ronšperk ('New Ronšperk'). Since then he was known as Dobrohost of Ronšperk, and Poběžovice was renamed Ronšperk. In 1864, the castle and the manor were bought by the noble family Coudenhove, later known as Coudenhove-Kalergi family.
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.