Colmberg Castle was built in the 13th century and purchased in 1318 by Duke Frederick IV of Nuremberg. In 1791 Colmberg fell under Prussian administration. From 1806 to 1880 it became the seat of the revenue office of the Kingdom of Bavaria. In 1927-1964 it was owned by the last Imperial Consul in Japan. Int1964 Unbehauen family of Colmberg bough the castle and started to reconstruct it into a comfortable hotel.
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.