Soissons is a commune in the Aisne department in Picardy in northern France, located on the Aisne River, about 100 kilometres (62 mi) northeast of Paris. It is one of the most ancient towns of France, and is probably the ancient capital of the Suessiones. Soissons is also the see of an ancient Roman Catholic diocese, whose establishment dates from about 300.
Soissons enters written history under its Celtic name (as later borrowed in Latin), Noviodunum, meaning "new hillfort". At Roman contact, it was a town of the Suessiones, mentioned by Julius Caesar (B. G. ii. 12).Today, Soissons is a commercial and manufacturing centre with the 12th century Soissons Cathedral and the ruins of St. Jean des Vignes Abbey as two of its most important historical buildings. The nearby Espace Pierres Folles contains a museum, geological trail, and botanical garden.