Château de Liettres was probably built some years before 1479 by Sir Simon de Luxembourg, provost of the church of Saint-Omer. In that year it was burned by the progressing army of Maximilian I of Austria.
In 1542 Liettres Castle was again burned and partly destroyed by the troops of the Duke of Vendome. Shortly thereafter the castle was bought by Jean de Zomberghe after which it remained in the hands of his descendants.
Liettres Castle was built on an artificial plot of dry ground in the marshy valley of the La Laquette stream which also fed its moats. During the course of centuries it underwent several transformations. In 1720 the main building was rebuilt. It consists of several buildings forming a square with strong cylindrical towers. It has walls of 2.5 meters up to 5 meters thick in some towers.
At present the castle is privately owned and inhabited.
References:Saint-Georges de Boscherville Abbey is a former Benedictine abbey. It was founded in about 1113 by Guillaume de Tancarville on the site of an earlier establishment of secular canons and settled by monks from the Abbey of Saint-Evroul. The abbey church made of Caumont stone was erected from 1113 to 1140. The Norman builders aimed to have very well-lit naves and they did this by means of tall, large windows, initially made possible by a wooden ceiling, which prevented uplift, although this was replaced by a Gothic vault in the 13th century. The chapter room was built after the abbey church and dates from the last quarter of the 12th century.
The arrival of the Maurist monks in 1659, after the disasters of the Wars of Religion, helped to get the abbey back on a firmer spiritual, architectural and economic footing. They erected a large monastic building one wing of which fitted tightly around the chapter house (which was otherwise left as it was).