Wildenburg castle was founded in the 13th century by the Lords of Hünenberg, vassals of the counts of Kyburg and Habsburg. The first plant was probably just a stone ring wall with wooden buildings. A round keep and a palas in the northeastern corner were added later. In 1386, the knights of Hünenberg fought against the Confederates at the Battle of Sempach on the side of Habsburg Austria. Wildenburg was destroyed after that. The castle was then left to decay and used as a quarry in the 16th century.
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.