Tiversk or Tiversky gorodok (Finnish: Tiurinlinna) was a medieval Russian fortified settlement situated on an island of the River Vuoksi. The fort was 215–300 m long and 40–56 m wide. It gained in prominence in 1323 when the Treaty of Nöteborg established a Novgorodian-Swedish border in the immediate vicinity. It was then mentioned in the Nikon Chronicle in 1404, when the settlement was granted to Prince Yury of Smolensk as an appanage. Seven years later, the fort was sacked and destroyed by the Swedes during one of the Swedish-Novgorodian Wars.
The site of Tiversk was first identified and described by Jacob Groot in 1847. The remnants were excavated in 1888-1891 by Hjalmar Appelgren, Theodor Schwindt and Alfred Hackman, in 1971 by Anatoly Kirpichnikov, and in 1971-1974 by Svetlana Kochkurkina. Most remnants are dated end of the 13th-beginning of the 15th century. In 1890 archaeological works revealed a treasure trove with 13th-15th century Arabic silver coins. Some remnants dated 10th-early 12th century have also been discovered. The ramparts and stone walls of the settlement were 4.5 to 7 metres thick.
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.