Dun Beag is an iron-age broch situated at the north end of a small rocky knoll. The broch consists of a drystone tower with a diameter of around 18.6 metres with walls about 4 metres thick at the base. The broch currently stands to a maximum height of 2 metres.
The interior has a diameter of about 11 metres, and the entrance is on the east side. Internally three openings are visible in the broch wall. One leads to a small chamber; a second leads to a long narrow gallery within the wall; and a third leads to the stone stair of which some twenty steps survive.
The broch was visited by Thomas Pennant in 1772, and it was still a substantial structure, with a height of perhaps 4 metres. Around half of its wall height has been lost since the 18th century. The broch was excavated by the Countess Vincent Baillet de Latour between 1914 and 1920. Some 200 tons of earth and stones were removed from the broch and all the soil was sifted through the excavators' fingers. The standard of recording and publication was poor. Finds included many stone implements and utensils, a gold ring, bronze objects, a piece of folded sheet lead, iron and glass objects, a borer of bone, a pick made from an antler, much pottery and a stone cup. Several hundred glass beads were found although they are not thought to be prehistoric. Coins of Henry II, Edward I, James VI, George II and George III have been discovered, and it is possible that the broch was in use until comparatively recently.
References:The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians.