Brecon Castle was built by the Norman Lord Bernard de Neufmarché in 1093, and was frequently assaulted by the Welsh in 13th and 15th centuries. The castle's ownership changed numerous times. It began falling into ruin when Henry VIII executed the last dukes of Buckingham, who at the time controlled the castle. It was renovated and made into a hotel in the early 19th century.
Numerous renovations were carried out through the castle's history. A shell keep made of stone was constructed in the late 12th century (the keep was initially made of wood). In 1233, a bailey wall, also made of stone, was constructed. Two towers, one round and the other semi-octagonal, were built in the 13th century and early 14th century, respectively. A hall block was added in 1300.
The castle had become mere ruins by the end of the Georgian era. Renovations were begun in 1809 by Sir Charles Morgan of Tredegar House, and more than £7,000 had been spent on the repairs by 1814. The castle was made a hotel, which it currently continues to be.
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.