Medieval lordship in Picardy in northern France; the castle and hill-top town of Coucy lie south of St Quentin and north of Soissons.
The lands originally belonged to the Archbishop of Reims, and became a lordship in the 10th century. The earlier lords belonged to the family of Boves; the last three (1310-97) to that of the Counts of Guines. Enguerrand VI (d.1346) married a Habsburg while the first wife of Enguerrand VII (d.1397) was the daughter of Edward III of England. Enguerrand VII’s heiress sold Coucy to the Duke of Orleans, whose grandson became Louis XII in 1498.