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Katsuyama Date (勝山館, Katsuyama-Date) is the remains of a castle or fortified residence in Hiyama, Hokkaido, Japan. It is believed the castle was built by Takeda Nobuhiro in the 15th century.
The castle is now only ruins, just some remnants of moats and earthen walls. Its ruins have been protected as a National Historic Site, since 1977. Guidance facility of the castle is on site.
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.