The abbey of Vaucelles, old Cistercian abbey founded in 1132 by Saint-Bernard, is the 13th daughter-house of Clairvaux. During the era of prosperity in the 12th and 13th centuries, the community included several hundred monks, lay brothers and novices. The 12th century claustral building is the only remains of this immense abbey, now open to the public. It included the Norman scriptorium, auditorium, chapter room (built in 1170). Vaucelles is the largest Cistercian chapter room in Europe and the acoustics are exceptional. The Sacred Passage where the remains of the first three abbots of Vaucelles, canonized by Pope Alexander III in 1179, are buried.
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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.