The Château d'Usson is one of the so-called Cathar castles located in the commune of Rouze. It is sited upstream from Axat, along the Aude River gorge, carved out of the foothills of the Pyrenees.
The castle dates from the 11th century (perhaps earlier) and during the Cathar period marked the eastern boundary of the territories of the Counts of Foix. In the 12th century, this was the capital of the Donézan region. Before the défilé was cut through the mountains to link Quillan to Axat, this was an inaccessible outpost providing succour for faidits and other persecuted Cathars. The Cathar bishop of Toulouse Guilhabert de Castres is known to have taken refuge here.
Towards the end of the wars against the Cathars this was one of their last sanctuaries, providing support for Montségur. The seigneurs of Usson, Bernard d'Alion, lord of the Château de Montaillou, and his brother Arnaud d'Usson sent arms and supplies to their besieged comrades there. On 15 March 1244, the day before 225 Cathar parfaits were burned alive at Montségur, four other parfaits left the castle there for Usson, where the Cathar treasure had been evacuated a few months earlier. This mystery has fed a number of theories about the equally mysterious treasure supposedly found at Rennes-le-Château in the 19th century.
Bernard d'Alion was burned alive at Perpignan in 1258. The castle was rebuilt as a French border fortress, and given by Louis XIV to the new Marquis d'Usson. Like other seigneural residences it was sold as communal property at the French Revolution, after which time it was used as a stone quarry.
On display at the castle are parts of the wreckage of a Second World War British Dakota transport aircraft which crashed on 5 December 1944 on a nearby mountain with the loss of seventeen lives.References:
Ängsö Castle was first named as "Engsev" in a royal charter by king Canute I of Sweden (r. 1167-1196), in which he stated that he had inherited the property after his father Eric IX of Sweden. Until 1272, it was owned by the Riseberga Abbey, and then taken over by Gregers Birgersson.
From 1475 until 1710, it was owned by the Sparre family. The current castle was built as a fortress by riksråd Bengt Fadersson Sparre in the 1480s. In 1522, Ängsö Castle was taken after a siege by king Gustav Vasa, since its owner, Fadersson's son Knut Bengtsson, sided with Christian II of Denmark. However, in 1538 it was given by the king to Bengtsson's daughter Hillevi Knutsdotter, who was married to Arvid Trolle.
In 1710, the castle was taken over by Carl Piper and Christina Piper. Ängsö Castle was owned by the Piper family from 1710 until 1971, and is now owned by the Westmanna foundation. The castle building itself was made into a museum in 1959 and was made a listed building in 1965. It is currently opened to visitors during the summers.
The castle is a cubical building in four stores made by stone and bricks. The lower parts is preserved from the middle ages. It was redecorated and expanded in the 1630s. The 4th storey as well as the roof is from the expansion of Carl Hårleman from 1740-41. It gained its current appearance in the 1740s.