Dun an Sticir is an Iron Age broch situated approximately 9.5 kilometers north of Lochmaddy in a lake on North Uist. A building was erected on the site in the late-medieval period. Dun an Sticir was probably built in the Iron Age in the period between 100 BC and 100 AD, like most brochs. Limited excavations resulted in finds of pottery.
The broch was probably inhabited during the Viking period. In the Middle Ages the broch was converted into a rectangular hall, or small tower. The entrance was enlarged and a window was constructed. Outbuildings were added and there was a larger building on Eilean na Mi-Chomhairle. The causeway from the north side of the lake to Eilean na Mi-Chomhairle was widened to 3 meters, so that carts could get to the island.
The broch has a total diameter of 18 metres. The walls of the broch are 3.5 metres thick and in some places a little more than three metres high. The circular interior of the broch was in the Middle Ages transformed into a rectangular area 10 metres by 4.6 metres. The axis is northeast-southwest. The entrances are 1.1 metres wide, located in the northwest and southwest of the rectangular space. The wall at the southwestern entrance is 2.5 metres thick.
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.