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Greifenstein castle was first mentioned in 1158. The castle was largely destroyed in the second half of the 13th century during the wars between Count Meinhard II of Tyrol-Gorizia and the Bishop of Trent. The reconstructed castle became property of the lords of Starkenberg after the last member of the family of Greifenstein was killed in the Battle of Sempach in 1386.
Greifenstein was besieged for weeks by Duke Frederick IV of Austria-Tyrol first in 1418 and again in 1423. During the second time castle was conquered in 1426. After the Habsburg family took the possession. Today Greifenstein lies in ruins.
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.