The year 674 saw the foundation of a monastery on the hill at the present-day location of the village. The first abbot wasSidonius (Saëns), an Irish monk and a disciple of StPhilibert of Jumièges. Sidonius died in about 689 and was buried in the monastery.
The castle was taken in 1204 by the French kingPhilip II Augustus and became part of France, like most of Normandy by this time.
About 1167[4] aCistercianconvent dedicated toMary Magdalene was founded near the village by nuns fromBival under the patronage ofEmpress Matilda. This was later upgraded to anabbey in 1629. The abbess was a friend of the king's mistress,Madame de Maintenon, who often contributed to the beautification of the church. By 1740, there was only one monk left at the monastery and after the Revolution it became the present-day church.
The castle and village were looted and burned by the English and the Burgundians in 1450 and again byHenry IV of France in 1592. That same year, the Spanish ravaged the manor of Quesnay.
In the 14th century, the town was famous for itsdrapers,blacksmiths,potters andcutlery.Glassmaking started here in 1450 at the hamlet of Bully and was active until 1807. Thetanneries were well-known up until the 19th century.