The Château d'Aurignac was built on a hill before 1240 by Bernard V, Counts of Comminges, and the village developed around it. Henry IV ordered the destruction of the castle in the early 17th century and, although it was still partly inhabited in 1627, it fell into disuse not long afterwards. All that remains today are the church, a well-restored keep on the peak of the hill and some of the ramparts, which have been incorporated into houses.
References:The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.