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L'Islet is a complicated and unique variation of a Cist-in-Circle monument. It dates from the Chalcolithic (2500 - 1800 BC). A central capstoned cist with an antechamber is surrounded by a D shaped ring of stones. Attached to the outer ring are four smaller rings two of which contain further slab lined cists. No bones were found but the central chamber contained a biconical pot. It is probable that the outer cists were later additions to an earlier single Cist-in-Circle.
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.