Église Notre Dame is a Roman Catholic church in the town of Clisson, France. It was founded by Olivier V de Clisson in the 14th–15th century. The church was razed during the War in the Vendée, and later renovated under the Empire in the early 19th century. It was completely demolished and rebuilt in 1885–88 by Nantais architect René Ménard, modelled after Roman basilicas.
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.