Hervé de Donzy, the Lord of Saint Aignan established Cornilly Abbey in the 11th century. It was authorized by Pope Urbanus II in 1091. The abbey grew rapidly, but in the 1357 it was destroyed by English Black Prince troops during the Hundred Years' War. Monks rebuilt the abbey, but it was again destroyed by religious fanatics in 1562. It was not rebuilt again and in the Revolution (1789) it was moved as a national property. Today impressive ruins remain, including parts of the 13th century church, western portal and choir. The Cornilly Abbey site is privately owned.
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).