Bergen auf Rügen Abbey was a monastery for Cistercian nuns. It lasted from the end of the 12th century to the early 16th century as a Roman-Catholic monastery and then, until 1945, as an Evangelical aristocratic nunnery.
The Principality of Rügen belonged to the Bishopric of Roskilde since its conquest by the Danes in 1168, Bishop Absalon of Lund being responsible for introducing the territory to Christianity. In 1193, Prince Jaromar I of Rügen founded a nunnery near the fort (Burgwall) on the Rugard, and had it consecrated as St. Mary's Church which had originally been planned as a palace church (Pfalzkirche). The monastery was a branch of St. Mary's Abbey, Roskilde, from which the first Benedictine sisters came. When the two monasteries transferred to the Cistercian order is not known. A confirmation of the Cistercian ordinances and possessions was made by Pope Innocent IV in 1250.
On its foundation, Jaromar I granted the monastery with extensive, but scattered, estates, which were mostly on the island of Rügen. Until the mid-14th century are only a few donations by his followers or internal documents of the monastery known. After that it was increasingly involved in the purchase of whole parishes, such as in 1344, which consisted of 14 villages, and in 1357 the estates of Arnold Pape, the goods of John of Kiel in Wieck, Dranske and Goos.
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.