Fort de La Prée, built in 1625, is located near the eastern end of the Île de Ré. It was built by Royalist Army after they conquered the are from Huguenots during the Wars of Religion. They used materials salvaged from the remains of the Romanesque abbey of the Châteliers'.
The Duke of Buckingham ignored Fort de La Prée during his three-month siege of Saint-Martin-de-Ré in 1627. This neglect turned out to be a strategic error. Toiras managed to land troops there, and from there force the English to give up their siege and withdraw in defeat.
The fort subsequently underwent modifications under the oversight of several engineers: François Blondel (1664), Louis-Nicolas de Clerville (1672), Le Favolière, and finally Sainte-Colombe (1676). They added the gate, a barracks for 200 soldiers outside the walls, and some other outside works.
In 1685, Vauban, the preeminent engineer of the time, had François Ferr raze parts of the original fort, particularly the keep and the outworks that enclosed the entire fort.
The fort was later abandoned before being re-established in 1793. During the latter part of the 19th century, the external barracks were demolished. In 1875, the fort's covered way had sheltered passages added. The fort was decommissioned circa 1900.
During World War II the Germans occupied the fort. They added some blockhouses in the ramparts and on the seafront. From 1948, the fort became the administrative block for a development of vacations homes, but was closed in 1977.
References:The Basilica of Santa Maria in Trastevere is one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140-43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I.
The inscription on the episcopal throne states that this is the first church in Rome dedicated to Mary, mother of Jesus, although some claim that privilege belongs to the Basilica di Santa Maria Maggiore. A Christian house-church was founded here about 220 by Pope Saint Callixtus I (217-222) on the site of the Taberna meritoria, a refuge for retired soldiers. The area was made available for Christian use by Emperor Alexander Severus when he settled a dispute between the Christians and tavern-keepers.
The church underwent two restorations in the fifth and eighth centuries and in 1140-43 it was re-erected on its old foundations under Pope Innocent II.