The construction of the Fort Regent fortress we see today began on 7 November 1806, during the Napoleonic Wars, with the laying of a foundation stone by George Don the Lieutenant Governor of Jersey. The fort was built using local workers and men from the Royal Engineers, with an average of 800 men working at any given time. This enabled the substantial amount of work to be completed 8 years later, in 1814. It was given the name Fort Regent in honour of Prince Regent, who was King of the United Kingdom of Great Britain and Ireland at this time. The design of the fort is credited to Lieutenant-General John Humfrey, and it is thought that Lieutenant-Colonel John Evelegh would have also worked on the final plans. The fort's main features are substantial curtain walls, ditches, a glacis, redoubts, bastions, and redans (or demi-bastions). There was a parade ground in the centre, which is now built upon, and covered with a roof.
During the Occupation of the Channel Islands the German forces made some additions to the fort including flak cannons. Some of these concrete structures remain today. In December 1967 the States of Jersey made a decision to adapt the site into a leisure centre.
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.