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:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.