Boulbonne Abbey was first founded in 1129 about 14km from its current location. It was burned down and demolished during the Wars of Religion in 1567 by Huguenots. The reconstruction of the abbey on its current site started in 1632. The church was consecrated in 1742.
After the French Revolution most of the buildings have disappeared, but there are still some facades, the entrance brick portal, the chapter house, the refectory, two corridors of the cloister and the dovecotes and stables.
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.