The Abbey of St. Jean des Vignes was a monastery of Augustinian Canons situated in the south western hills of Soissons. Only ruins remain, of which the west front is still one of the most spectacular pieces of architecture in the town.
The abbey was founded on St. John's hill in 1076 by Hughes Le Blanc. Initially built in Romanesque style, the first buildings were replaced at the end of the 12th century by those visible today. The west front was begun in the 12th century, although not finished until the 16th. The refectory and cellar date from the 13th century, parts of the cloisters from the end of the 13th century, while other parts are from the 16th century, as is the abbot's lodging.
When the abbey was suppressed during the French Revolution the premises were put to use for military purposes, and an arsenal was added.
The site was acquired by the town of Soissons in the 1970s and the remaining buildings are now occupied by educational and heritage-related bodies.
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.