Fontenelles Abbey was an Augustinian monastery in the former commune of Saint-André-d'Ornay. The abbey was founded in 1210 by local landowners Guillaume de Mauléon, seigneur of Talmont-Saint-Hilaire, and his wife Béatrice de Machecoul, lady of the manors of La Roche-sur-Yon and Luçon. The monastery was originally Benedictine but after a lawsuit broke out between the abbot of Fontenelles and the abbot of Marmoutier, a prestigious Benedictine monastery, the community became Augustinian, as a daughter house of the nearby Chancelade Abbey, in about 1224.
The church was damaged during the Hundred Years' War. In 1533 there were only 9 monks here. In 1562 during the Wars of Religion Protestants attacked the abbey, killing some of the monks, set it on fire and largely destroyed it. In particular they damaged the church to the extent that part of nave collapsed, leaving it permanently shortened, with a Greek cross floor plan. Protestants attacked it again in the 1620s but were forced to repair the damage. The monastery was restored from 1669 onwards by the canons of the Congrégation de France.
The abbey, by that time containing only three monks, was suppressed during the French Revolution in 1791. In 1794 the passage of the 'infernal columns' through the Vendée left it entirely abandoned. The site was later used for agriculture: the church was turned into a barn and the abbot's lodging into accommodation for labourers. Continued neglect brought about the collapse of most of the remaining buildings including in 1935 the collapse of the south transept of what was left of the church. The site remains private property.
The monastery was built in granite in the Angevin Gothic style, transitional between Romanesque and Gothic. The truncated church is the most intact structure remaining, and contains the tomb of either the foundress Béatrice de Machecoul or her daughter Jeanne, Vicomtesse de Thouars, consisting of a recumbent effigy (gisant) in an arched recess (arcosolium) with small figures. There are also substantial remains of the chapter room but the rest of the former structures are in ruins.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.