In the 11th century, the Romanesque abbey church was founded over a set of crypts where the rock comes to an apex, and the first monastery buildings were built up against its north wall.
In the 12th century, the Romanesque monastery buildings were extended to the west and south.
In the 13th century, a donation by the king of France, Philip Augustus, in the wake of his conquest of Normandy, enabled a start to be made on the Gothic section of the "Merveille ": two three-storey buildings, crowned by the cloister and the refectory.