Hässelby Castle (Hässelby slott) was built first in the 1640s by the riksråd Karl Bonde, who owned it until his death 1652. The original architect was Simon de la Vallée and the castle was finished about the 1660s by his son Jean de la Vallée, when Karl's son Gustaf Bonde owned it. The Bonde noble family owned the castle until 1931, when Stockholms stad bought it until 2010. Since 2010 SIVAB own the castle. Today Hässelby is opened for weddings, parties and conferences.
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.