The Abbey Church of Otterberg was founded in 1143 by Cistercians as the abbey church of a daughter abbey of the Eberbach monastery. In the 15th century, the monastery slowly declined. In 1504, and in 1525 during the Peasants' War, the monastery was burned and plundered. At the end of the 16th century, the abbey church began to be used simultaneously by the Catholic and Protestant parishes, but not without causing disputes. In 1708, therefore, a separation wall was built between the two spaces. The choir hall with the transept is now used as the Catholic part, the remaining nave as the Protestant part. In 1979, the wall was removed as part of a major renovation, but the structure of the property was not changed.
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.