The first known owner of Sjöö castle was Peter Laurensson, mentioned in 1409. In 1541 the castle was bought by Jacob Vestgöte Sjöö and named after him. The present castle was built during the ownership of Johan Gabriel Stenbock. The castle was designed by Nicodemus Tessin the Elder and Mathias Spieler. The castle with its park is considered one of the most beautiful castles in Sweden with its perfect and harmonious proportions. In 1813 Sjöö castle was sold to Johan Gustav Baner, and it's still owned by the family Baner.
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.