Kohren Castle, also known as Chorun or Sahlis, is the ruin of an imposing hill castle in the town of Kohren-Sahlis in Leipzig county in Saxony.
The origin of the town Kohren can be traced back to the time of the Sorbian settlement in the Early Middle Ages. Emperor Otto II gifted the forest between the rivers Saale and Mulde to the Bishop of Merseburg in year 974.
The castle was owned by Kohren family from the late 12th century, but i was destroyed in 1220 during local wars. The current towers were built after that, but it was again demolished during the mid-15th and 17th centuries.
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.