Hervé de Donzy, the Lord of Saint Aignan established Cornilly Abbey in the 11th century. It was authorized by Pope Urbanus II in 1091. The abbey grew rapidly, but in the 1357 it was destroyed by English Black Prince troops during the Hundred Years' War. Monks rebuilt the abbey, but it was again destroyed by religious fanatics in 1562. It was not rebuilt again and in the Revolution (1789) it was moved as a national property. Today impressive ruins remain, including parts of the 13th century church, western portal and choir. The Cornilly Abbey site is privately owned.
References: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.