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:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.