Opprebais Castle was built in the first half of the 13th century or maybe at the end of the 12th century probably by a local noble family. It is a square castle with round corner towers. In 1486, the seigniory was sold to Jean de Glimes. It remained in the hands of his descendants until 1660 when the castle was sold to the Dukes of Arenberg. In the 17th century a farm was built inside its walls.
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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.