Ribadavia Castle, sitting at what is the unofficial entry point to the old town, has relics dating back as far as the 9th century, but the main structure was erected during the 15th century at the behest of the then Count of Ribadavia. It was abandoned in the 17th century when the counts moved to the palace adjacent to main square of Ribadavia.
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.