Kapitelberget ruined church is the foremost reminder of the powerful Dags family in Skien. It was a crypt church, one of the only four similar churches in Norway. Kapitelberget was built as a private chapel by Dag Eilivsson in the 12th century. It may have been destroyed when Bratsberg farm burned in 1156.
The church was situated on the highest point in the vicinity of Skien at the top of the range of hills to the east of the town centre. The ruins were discovered in 1783, but were not restored until the end of the 20th century.
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.