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.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.