Ruins of Starý Rybník castle are on a tiny rocky ridge between two ponds at the village of Starý Rybník. The castle was probably founded sometime during later part of the 14th century. Soon afterwards the castle passed on to the Frankengrüner family from Cheb. It was later acquired by the Gumerauers and the Brambachs, and throughout the major part of the 16th century it belonged to the Lords of Wirsperg. In the following years, it frequently changed hands, from the Trautenbergs to the Hartenbergs and later to the Perglars of Perglas. In 1787, it was acquired by Johann Georg Wilhelm whose family held it up to 1945.
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.