It is not exactly known when the Abbaye de Sainte-Trinité in Lessay was established; other historians date it to 1056, Cologne University to 1105. The vaults of the church, built around 1100 are however probably the oldest in Normandy. The abbey flourished in the 12th and 13th centuries, but during the Hundred Years' War in 1356 it was burned and looted. The nave and tower were badly damaged and restored in 1385. Lessay Abbey suffered again in the French Wars of Religion, when it was looted twice. Again in World War II the bombings of Normandy invansion in 1944 destroyed it partially and restoration took 12 years.References:
The abbey was not bombed in 1944 but was deliberately blown up by German land mines before the Germans retreated.
Dating from the 15th century, Kisimul is the only significant surviving medieval castle in the Outer Hebrides. It was the residence of the chief of the Macneils of Barra, who claimed descent from the legendary Niall of the Nine Hostages. Tradition tells of the Macneils settling in Barra in the 11th century, but it was only in 1427 that Gilleonan Macneil comes on record as the first lord. He probably built the castle that dominates the rocky islet, and in its shadow a crew house for his personal galley and crew. The sea coursed through Macneil veins, and a descendant, Ruari ‘the Turbulent’, was arrested for piracy of an English ship during King James VI’s reign in the later 16th century.
Heavy debts eventually forced the Macneil chiefs to sell Barra in 1838. However, a descendant, Robert Lister Macneil, the 45th Chief, repurchased the estate in 1937, and set about restoring his ancestral seat. It passed into Historic Scotland’s care in 2000.
The castle dates essentially from the 15th century. It takes the form of a three-storey tower house. This formed the residence of the clan chief. An associated curtain wall fringed the small rock on which the castle stood, and enclosed a small courtyard in which there are ancillary buildings. These comprised a feasting hall, a chapel, a tanist’s house and a watchman’s house. Most were restored in the 20th century, the tanist’s house serving as the family home of the Macneils. A well near the postern gate is fed with fresh water from an underground seam. Outside the curtain wall, beside the original landing-place, are the foundations of the crew house, where the sailors manning their chief’s galley had their quarters.