Le Dolmen du Couperon is a Chalcolithic (3250 - 2250BC), 8m long capstoned chamber surrounded by a ring of 18 curb stones known as a 'peristalith'. Originally covered by a long mound what remains today is largely the work of restorers. When first excavated in 1868 the capstones had fallen into the chamber. These stones, including a porthole stone were lifted and placed as capstones. In 1919 the Société Jersiaise removed the porthole stone which had been incorrectly placed as a capstone and moved it to its current position at the eastern end of the chamber. Finds included a few flint flakes and pottery fragments.
The adjacent Le Couperon Guardhouse was built in 1689 of local stone, with brick lintels. It supported a battery on the headland above as a magazine and shelter for the members of the Jersey militia that served the battery. The battery commanded Rozel Bay and by 1812 consisted of two 24-pounder muzzle-loading guns that fired over a low wall, which has long disappeared.
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.